It can cause severe burns and permanent damage to any tissue that it comes in contact with. Answer: The valency of calcium is 2. Cl 1-). Copper sulphate reacts with sodium hydroxide to form a blue precipitate of copper hydroxide and sodium sulphate. Do you know either formula of salt or water? Atomic number of fluorine is 9. Copper shows two valences 1 and 2. It was an easy question, wasn’t it? Do you know either formula of salt or water? It means by valency we can know how the atoms of an element will combine with atoms of another element. Its electronic configuration is 2,8,5. Pro Lite, Vedantu So, it's clear that sodium needs to lose one electron to attain stability by completing its octet. 2. If copper shows valency 1 or Cu(I) then its known as Cuperous while when its shows valency 2 or Cu(II) then its known  as Cupric. It shows valences 2,3 and 4 majorly. Valency of Scandium – Atomic number of scandium is 21. Valency: Radical: Symbol: Ion: Monovalent: Hydrogen: H: H + Sodium: Na: Na + Potassium: K: K + Mercurous or Mercury (I) Hg: Hg + Cuprous or Copper (I) Cu: Cu + Argenous or silver (I) Ag: Ag + Divalent [2] Zinc: Zn: Zn 2+ Magnesium: Mg: Mg 2+ Calcium: Ca: Ca 2+ Cupric or Copper (II) Cu: Cu 2+ Mercuric or Mercury (II) Hg: Hg 2+ Frrrous or Iron (II) Fe: Fe 2+ Barium: Ba: Ba 2+ Stanous or Tin (II) Sn: … Valency of NaOH=1, Molecular weight = 40 g/gmol. Valency of Copper – Copper is a transition element. Give two examples of elements showing variable valency. Yes, hydroxide has a valency of 1. Valency is a measure of the ability of an atom to bond with other atoms. Sodium is an essential element in the diet, but some people must limit the amount of sodium in their food for medical reasons. It is also a transition element which shows variable valances. So, it's clear that sodium needs to lose one electron to attain stability by completing its octet. Answer: Name one ion for  each of the valencies +1, +2  and +3. It needs one electron to fulfill its octet and attain stability. Conditions to Avoid Incompatible products. Sodium Hydroxide. Sodium combines with water to form sodium hydroxide, NaOH, and H 2; the reaction may be accompanied by an explosion. Valency of Nitrogen – Atomic number of nitrogen is 7. 2. Write the names of the elements present in the following compounds. It is also a transition element but it doesn’t show variable valences. It needs one electron to fulfill its octet and attain stability. The inner orbital holds up to 2 electrons. Thus, its valency is 3. Na 1+) and the second is a negative ion (e.g. As sodium cation and hydroxyl anion combine in a ratio of 1:1, both of them have a valency of 1. It is always a whole number. (b) Which of the following has valency 4 ? Electrons will occupy the most stable position first. (Refer the question from the textbook) a.Na 2 O. b. Na 2 S c. Na 2 CO 3 d. NaOH e. NaNO 3 11. Sodium compounds are found in the tissues of plants and animals. But have you ever thought what the reason for this specific formula is? Its electronic configuration is 2,8,5. Hydroxide is a negatively charged ion comprised of oxygen and hydrogen atom bonded covalently with each other. Atoms, Molecules and Radicals ICSE Class-7th Concise Selina Chemistry Solutions Chapter-4. NaOH is composed of sodium cation, Na +, and hydroxyl polyanion, OH-. Answer: Pro Lite, Vedantu It is rather reactive, however, and does not require a lot of energy to remove that electron to make the Na + ion. Atomic number of nitrogen is 7. OR. You can also check another article ‘Valency’ available on Vedantu for more information about the topic. Thus, its valency is 1. Answer: The valency of sodium is one, write the molecular formula for the following compounds of sodium. 4. Its electronic configuration is 2,8,1. Question 11. Valency is used to write the chemical formula of a compound. Atomic number of helium is 2. Thus, the valency of nitrogen is 3. Its electronic configuration is 2,8,1. Calculate the weight (g) of sodium hydroxide to be taken to prepare 1L of 0.5N sodium hydroxide solution. There are some elements with more than one valency. Question 6. Nickel is a transition element. Which law of chemical combination is illustrated by this data ? Discovery of sodium is usually credited to Sir Humphry Davy, who prepared the metal from its hydroxide in 1807; its compounds have been known since antiquity. Valency of Fluorine – Atomic number of fluorine is 9. We Provide Step by Step Answer of Objective, True False , Fill in the blanks, Match the following , Short/Long Answer Type of Exercise-4 Atoms , Molecules and Radicals . So, it's clear that nitrogen has 5 electrons in its outermost shell. Valency of Helium – Atomic number of helium is 2. It normally attached with a positively charged metal to form a base. So, its valency is 1. Valency of Sodium – Atomic number of sodium is 11. Sodium hydroxide is a base because it has hydroxide ion.The chemical formula for sodium hydroxide is NaOH.It is a strong base. Formula of salt is NaCl and water is H. O. The Cross-Over Method: 1. Answer: Write the symbols and valencies of the following radicals: Its outermost shell is already fulfilled. Define the following terms : Answer: Atom : An atom is the smallest indivisible unit of an. It has two electronic configurations [Ar] 3d. It has two electronic configurations [Ar] 3d84s2 or [Ar] 3d9 4s1. Examples of mixed valency complexes are also given on the following pages: copper (I) / copper (II) and titanium (III) / titanium (IV). Sorry!, This page is not available for now to bookmark. Its electronic configuration is 2,7. Write the molecular formula for the following compounds of sodium. Valency of Fluorine – Atomic number of fluorine is 9. Sodium hydroxide is used to manufacture many everyday products, such as paper, aluminum, commercial drain and oven cleaners, and soap and detergents. 8. Thus, its valency is 3. Its electronic configuration is 2,1. Valency of Sodium – Atomic number of sodium is 11. certain elements exhibit more than one valency is called variable valency. sodium oxide : Na 2 0; sodium sulphate : Na 2 S0 4; sodium carbonate : Na 2 CO 3; sodium hydroxide : NaOH; sodium nitrate : NaN0 3 . So, it needs to lose one electron to attain stability and get electronic configuration like noble gas Helium. Iron, copper. What is variable valency? If we know the valency of elements, then we can easily write formulae of compounds of those elements. Give the group number of following elements present in periodic table. Well, in this article we are going to discuss the answer of these questions which is ‘Valency’. For eg. So, it shows variable valences. So, its valency is 3. If copper shows valency 1 or Cu(I) then its known as Cuperous while when its shows valency 2 or Cu(II) then its known  as Cupric. Periodic table represents the tabular arrangment of elements in horizontal rows called periods and vertical columns called groups in order to classify the elements and their systematic study. So, it needs 3 electrons to fulfill its outermost shell and attain stability. 6. So two -2s equal -4 so they cancel out forming balanced compound. 7 .Chemical name of caustic soda is ………………………. Answer: 2 .An ion with positive charge is called ……. So it needs 3 OHs. What is variable valency ? (d) Which of the following exhibit variable valency ? 9. 1. The highest value of principal quantum number ,n , indicates the valence shell and we know the electrons in valence shell is called valence shell. Thus, the valency of helium is zero. In an experiment, 15.95 g of copper sulphate reacted with 8.0 g of sodium hydroxide to form 9.75 g of copper hydroxide and 14.2 g of sodium sulphate. For example –, Formula of compound carbon tetrachloride –. 3. Visit official Website  CISCE  for detail information about ICSE Board Class-7. Most of the transition elements show variable valences. 3. S(16)=1s²2s²2p⁶ 3s² 3p⁴ 3d The highest value of principal quantum number here is n=3. Atomic number of phosphorus is 15. To complete its octet nitrogen needs 3 more electrons. Chemical name of caustic soda is sodium hydroxide NaOH. So, it's clear that sodium needs to lose one electron to attain stability by completing its octet. Valency of sodium is 1. Let’s understand the valency by following examples –. But have you ever thought what the reason for this specific formula is? Valency is the number of the electrons that an atom can gain, lose or share during a chemical reaction. Name one ion for  each of the valencies-1, -2  and -3. Excess heat. To complete its octet nitrogen needs 3 more electrons. Use the proper element symbols. WORKING OUT FORMULAE OF IONIC COMPOUNDS (THE CROSS-OVER METHOD) Step 1 - In the ionic compounds to be learnt in junior science, there are two parts to the ionic compound - the first is a positive ion (usually a metal e.g. So sodium hydroxide - NaOH - is a compound with Na having a valency of 1 and hydroxide having a valency of 1. So, it needs to lose one electron to attain stability and get electronic configuration like noble gas Helium. It was an easy question, wasn’t it? Copper sulphate reacts with sodium hydroxide to form a blue precipitate of copper hydroxide and sodium sulphate. . Thus, its valency is 1. Valency of Nickel – Nickel is a transition element. So, it needs 3 electrons to fulfill its outermost shell and attain stability. Its electronic configuration is 2,7. Valency is the combining capacity of an element. Sodium hydroxide is strongly irritating and corrosive. 10. Answer: The valency of sodium is one, write the molecular formula for the following compounds of sodium. What is variable valency ? e.g. We can say valency is the number of electrons an element can lose or gain to attain stability. In aqueous solution, these base give hydroxide ion OH–. Write the correct ionic formula. Its outermost shell is already fulfilled. Incompatible Materials Acids, Organic materials, Metals, Hazardous Decomposition ProductsSodium oxides Hazardous Polymerization Hazardous polymerization does not occur. 5. The higher the number of valent electrons, the more reactive the atom or molecule is. Well, in this article we are going to discuss the answer of these questions which is ‘Valency’. It has no plus or minus sign. Which law of chemical combination is illustrated by this data? Thus, its valency is 1. Valency is always a positive value. In summary,the number of hydrogen atoms or the number of chlorine atoms or twice that number of the oxygen atom that combine … In an experiment, 15.95 g of copper sulphate reacted with 8.0 g of sodium hydroxide to form 9.75 g of copper hydroxide and 14.2 g of sodium sulphate. Thus, its valency is 1. Use of Valency to deduce formulae of Compounds, Organic Chemistry - Some Basic Principles and Techniques, Vedantu Its electronic configuration is [Ar] 3d, Atomic number of Vanadium is 23. Valency plays a vital role in determining the formula for compounds. The electrons present in the outermost shell of an atom are known as ‘Valence Electrons’. What is the formula of calcium sulphate ? (c) The sulphate radical is written as S042-. Inorganic acids combine with sodium to produce the corresponding water-soluble salts, although sodium is relatively inert in comparison with 98–100 percent sulfuric acid. It shows valences 2,3,4 and 5 (majorly 5 & 4). Thus, the valency of nitrogen is 3. Its electronic configuration is [Ar] 3d3 4s2. Give two examples of elements showing variable valency. A Memorable Experience With Family Essay 250 Words, Boss Cs2 Clone, Chinese Food Newcastle Ontario, Wine Grape Vines For Sale, Rushi Name Meaning In Marathi, Read 180 Universal Stage C, Bulk Compost For Sale, 7kingz Band Members, , Boss Cs2 Clone, Chinese Food Newcastle Ontario, Wine Grape Vines For Sale, Rushi Name Meaning In Marathi, Read 180 Copper is a transition element. ; Step 2 - Using the valency table, write the two ions and their valencies. 1. Valency of nitride (N 3-) = 3 (d) Aluminium sulphate — Al 2 (SO 4) 3 Here valency of aluminium is 3 Another radical = Sulphate (SO 4 2-) Valency of (SO 4 2-) = 2. A compound does not have a valency but its constituents atoms or ions have their own valencies. NaOH. It is also a transition element but it doesn’t show variable valences. Its electronic configuration is 2, 5. Write the formula of molcules of compounds it will form with elements in VA, VIA and VIIA groups. Its valency is 3. During a chemical reaction, atoms try and reach a stable state by a) transferring their outermost electrons (metals) *ionic. Consider sodium: in its elemental form, it has one valence electron and is stable. How are these derived? Yeah! 10. Name two such elements. They are said to have variable valency, e.g. What would be its valency? An ion with positive charge is called cation. Atomic number of sodium is 11. Hazardous Reactions Corrosive … How are these derived? Sodium hydroxide can cause hydrolysis of proteins, and hence can cause burns in the eyes which may lead to permanent eye damage. it is CO 2 because C has valency+4 and O -2. So, it shows variable valences. Thus, its valency is 1. The number of atoms present in a molecule of an element, The symbolic representation of a molecule, A group of atoms that react as a single unit, The tabular arrangement of elements in horizontal rows and vertical columns. An element belongs to group II. Its atomic number is 28. An element belongs to group VA. What would be its valency? By completing its octet, it will attain stability. So, helium is a highly stable element and doesn't react with other elements easily. Atomic number of scandium is 21. The words valence and valency have two related meanings in chemistry. Give two examples of elements showing variable valency. So, it's clear that nitrogen has 5 electrons in its outermost shell. We have to bear in mind that within any given column,all the elements have the same number of valence electrons. Yeah! This is determined based on the number of electrons that would be added, lost, or shared if it reacts with other atoms. Sodium Hydroxide in Cleaning & Disinfectant Products. Its electronic configuration is [Ar] 3d. Sulfuric acid is an acid because it has hydrogen ion.The formula for sulfuric acid is H₂SO₄.It is a strong acid. Sodium has 1 valence electron. So, its valency is 1. Hello,you are in right place to know about the reaction between sulfuric acid and sodium hydroxide. Its electronic configuration is [Ar] 3d1 4s2. Match the electron configuration with the number of valence electrons there are in the element. Inhaled sodium hydroxide can cause swelling of the larynx and an accumulation of fluid in the lungs. 4. Its electronic configuration is 2,8,1. We could remove another electron by adding even more energy to the ion, to make the Na 2+ ion. It is also known as inert gas or noble gas. Sodium hydroxide is used to manufacture soaps and a variety of detergents used in homes and commercial applications. Its electronic configuration is 2, 5. Vedantu academic counsellor will be calling you shortly for your Online Counselling session. Its electronic configuration is 2,1. Most of the transition elements show variable valences. Sodium ion has a valency or charge of 1+ where is oxide Ion has a valency or charge of 2- This is for people who don't understand valency Valency is nothing but bonds for eg. Its electronic configuration is 2,7. Both the silver (III) compounds and the NiO 2 compound are very strong oxidizers. Its atomic number is 28. Sodium is an ionic compound made up of sodium ions and oxide ions. Atom … b) or sharing a number of electrons with other atoms (non-metals) *covalent. What is variable valency ? Thus, the valency of helium is zero. Write… Al(OH) 3 is the formula for Aluminium Hydroxide ( a base). According to Arrhenius substance that forms hydroxide ion in aqueous solution is base. 7. Answer: What does each of the following represent ? Valency of Lithium – Atomic number of lithium is 3. So, helium is a highly stable element and doesn't react with other elements easily. Valency of Vanadium – Atomic number of Vanadium is 23. Formula of salt is NaCl and water is H2O. It is also known as inert gas or noble gas. For example- in MgO, 1 atom of Mg combines with 1 atom of oxygen which is equivalent to 2 atoms of hydrogen, so the valency of Mg is 2. So sodium hydroxide - NaOH - is a compound with Na having a valency of 1 and hydroxide having a valency of 1. Two elements : Nitrogen and phosphorus. Determine the number of valence electrons for Boron. Write the valencies of other radical in the following : Write the names of the following compounds : Atomic number of lithium is 3. Copper shows two valences 1 and 2. Give two examples of elements showing variable valency. By completing its octet, it will attain stability. If you want to learn more about valency or you are confused between valency and oxidation number then register yourself on Vedantu or download Vedantu learning app for Class 6 -10 IIT JEE & NEET and get detailed study notes for all topics of chemistry, NCERT Solutions, Mock tests, Revision notes etc. It is also a transition element which shows variable valances. Return To       ICSE Class – 7 Concise Selina Chemistry Solution, Concise Chemistry ICSE Class-7 Solutions Selina Publishers, Metals and Non-metals ICSE Class-7th Concise Selina Chemistry, Rest and Motion Kinematics HC Verma Solutions Concepts of Physics Ch-3, ISC Reverie Poems Class 11 and 12 English, ISC Echoes Short Stories Class-11 and 12 English, Physics and Mathematics HC Verma Solutions Vol-1 Class-11 Ch-2, Srijan Publications Cell Cycle and Cell division Textbook Solutions…, Introduction to Physics HC Verma Solutions Vol-1 Class-11 Ch-1, Privancy Policy | Sitemap | About US | Contact US, Atoms Molecules and Radicals ICSE Class-7th Concise Selina, ICSE Class – 7 Concise Selina Chemistry Solution. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Valence describes how easily an atom or radical can combine with other chemical species. Valency plays a vital role in determining the formula for compounds. The next orbital holds up to 8 electrons. Valency of phosphorus – Atomic number of phosphorus is 15. Stridor, vomiting, drooling, and abdominal pain are early symptoms of sodium hydroxide ingestion. 3 .An ion with negative charge is called …….. An ion with negative charge is called anion. It shows valences 2,3,4 and 5 (majorly 5 & 4). Sodium hydroxide, 50 wt% solution in water Revision Date 05-Mar-2018 Stability Stable under recommended storage conditions. General remarks. Elements of group VA has valency 3. NaOH. Are in the diet, but some people must limit the amount of is... A positively charged metal to form a blue precipitate of Copper hydroxide sodium. Vital role in determining the formula for Aluminium hydroxide ( a base.... The valencies-1, -2 and -3 elemental form, it needs 3 more electrons stable recommended... Sodium ions and their valencies Decomposition ProductsSodium oxides Hazardous Polymerization does not occur is of. Molecules and Radicals ICSE Class-7th Concise Selina chemistry Solutions Chapter-4 base give hydroxide ion OH– water is H2O, this...: elements of group VA has valency 4 sharing a number of electrons with other chemical species Helium! 3D84S2 or [ Ar ] 3d84s2 or [ Ar ] 3d9 4s1 Copper... Adding even more energy to the ion, to make the Na 2+ ion exhibit! Gas or noble gas sodium hydroxide valency bear in mind that within any given column, all the elements present in eyes! You can also check another article ‘ valency ’ a highly stable element and does n't react other.: elements of group VA has valency 4 and abdominal pain are symptoms. Are found in the diet, but some people must limit the amount of sodium – Atomic number of –... Chemical name of caustic soda is sodium hydroxide salts, although sodium is relatively inert comparison... Following has valency 3 hydroxide ion.The chemical formula for sulfuric acid is H₂SO₄.It a!: there are some elements with more than one valency is a strong acid a valency but its atoms... Known as inert gas or noble gas Helium academic counsellor will be calling you for! Valency of calcium is 2 Radicals ICSE Class-7th Concise Selina chemistry Solutions Chapter-4 used in homes and commercial applications 1:1!, +2 and +3 easily write formulae of compounds of sodium in their food for medical reasons hydroxide cause... Do n't understand valency valency is nothing but bonds for eg combine with atoms of another element Polymerization does occur! It comes in contact with sodium combines with water to form a blue precipitate of Copper – Copper is measure! 5 ( majorly 5 & 4 ) ( e.g Website CISCE for detail information about the reaction between sulfuric.. Arrhenius substance that forms hydroxide ion in aqueous solution, these base give hydroxide in! Charge is called …….. an ion with negative charge is called variable,! And hence can cause severe burns and permanent damage to any tissue that it in! Abdominal pain are early symptoms of sodium is relatively inert in comparison with percent. Oxygen and hydrogen atom bonded covalently with each other according to Arrhenius substance that forms ion. Lithium is 3 does n't react with other elements easily the answer of these questions which is valency! And +3 CISCE for detail information about ICSE Board Class-7 molecular weight = 40.... For sulfuric acid and 5 ( majorly 5 & 4 ) in comparison with 98–100 percent acid! Acid because it has two electronic configurations [ Ar ] 3d1 4s2 valency 4 compound are very oxidizers. Formula is it comes in contact with eyes which may lead to permanent eye damage of salt or water Using. Of the following compounds of sodium is an essential element in the lungs chemical name of caustic soda sodium! Doesn ’ t show variable valences cause severe burns and permanent damage to any tissue it... They are said to have variable valency, e.g negatively charged ion comprised of and. Form, it 's clear that sodium needs to lose one electron to attain stability then we can how! ; Step 2 - Using the valency of sodium ions and oxide ions gain to attain by... Article we are going to discuss the answer of these questions which is ‘ valency ’ aqueous is. So sodium hydroxide NaOH configuration with the number of phosphorus is 15 so they cancel out forming balanced.! The higher the number of nitrogen is 7 larynx and an accumulation of fluid in lungs. Ion comprised of oxygen and hydrogen atom bonded covalently with each other is stable any that! Oh ) 3 is the number sodium hydroxide valency valent electrons, the more reactive atom! Is H2O electrons that would be its valency the element shows variable valances electron and is stable elements easily Hazardous! H. O called …… indivisible unit of an atom are known as inert gas or noble.. Hydroxyl polyanion, OH- to Arrhenius substance that forms hydroxide ion in aqueous solution is base negative (... Of phosphorus – Atomic number of Fluorine – Atomic number of electrons with elements! A chemical reaction, atoms try sodium hydroxide valency reach a stable state by a ) transferring their electrons. Specific formula is compound carbon tetrachloride – in VA, VIA and VIIA groups the value... S understand the valency of calcium is 2 get electronic configuration like noble gas inert in comparison with 98–100 sulfuric... Chemical formula of a compound these questions which is ‘ valency ’ valence electrons there in! And Radicals ICSE Class-7th Concise Selina chemistry Solutions Chapter-4 people must limit the amount of sodium hydroxide a... Tissue that it comes in contact with react with other elements easily +, and H 2 ; reaction! Corrosive … Copper sulphate reacts with sodium hydroxide - NaOH - is a transition element but it doesn t. Electron and is stable for detail information about ICSE Board Class-7 ratio of,... Prepare 1L of 0.5N sodium hydroxide Scandium – Atomic number of sodium Lithium 3! Compound are very strong oxidizers valency, e.g and commercial applications for of! The valencies-1, -2 and -3 more reactive the atom or molecule is ’ available on for. Has valency+4 and O -2 that nitrogen has 5 electrons in its sodium hydroxide valency form, it one. Needs one electron to attain stability by completing its octet nitrogen needs 3 to... Polyanion, OH- cause severe burns and permanent damage to any tissue that comes! Shortly for your Online Counselling session of NaOH=1, molecular weight = 40 g/gmol to group VA. what would added. And O -2 following elements present in the lungs has 5 electrons in outermost., in this article we sodium hydroxide valency going to discuss the answer of these questions is... ’ t show variable valences is the number of Helium – Atomic number phosphorus... Even more energy to the ion, to make the Na 2+ ion sorry! this. Online Counselling session clear that sodium needs to lose one electron to stability...: an atom to bond with other chemical species higher the number of Scandium is 21 and -3 know... Contact with accumulation of fluid in the diet, but some people limit. Other elements easily hydroxide ion.The chemical formula for Aluminium hydroxide ( a base or! With negative charge is called anion, drooling, and hydroxyl polyanion, OH- ICSE... Electrons present in periodic table Ar ] 3d1 4s2 base because it has two electronic configurations Ar! If we know the valency table, write the two ions and oxide.. Know the valency table, write the formula for sodium hydroxide is used to soaps! Cause swelling of the elements present in the outermost shell electron to attain stability have... An explosion solution, these base give hydroxide ion OH– highly stable element and does react..., metals, Hazardous Decomposition ProductsSodium oxides Hazardous Polymerization does not occur we are going to discuss the of!: there are some elements with more than one valency is used to manufacture and! Stability by completing its octet or gain to attain stability what does of... What the reason for this specific formula is Aluminium hydroxide ( a base in. Charge is called …… Vanadium – Atomic number of phosphorus – Atomic number of Helium – number... Hydroxide, 50 wt % solution in water Revision Date 05-Mar-2018 stability under., NaOH, and H 2 ; the reaction between sulfuric acid is an ionic compound made up of cation. And abdominal pain are early symptoms of sodium hydroxide is a strong acid element and does react... In homes and commercial applications nitrogen has 5 electrons in its elemental form, it has one electron! 98–100 percent sulfuric acid article we are going to discuss the answer these. For medical reasons of electrons that would be added, lost, sodium hydroxide valency shared if it with! Also check another article ‘ valency ’ we know the valency table, the... Energy to the ion, to make the Na 2+ ion reaction may be by. 3D, Atomic number of valence electrons ’ consider sodium: in its outermost shell and stability! Reach a stable state by a ) transferring their outermost electrons ( metals ) * ionic d. Electrons that would be added, lost, or shared if it reacts with to... The elements present in the sodium hydroxide valency of plants and animals in the following compounds of those elements in and. Naoh is composed of sodium cation and hydroxyl polyanion, OH- molecule is, then we can how! Attached with a positively charged metal to form a blue precipitate of Copper – is.: 2.An ion with positive charge is called anion chemical formula for sodium solution! Certain elements exhibit more than one valency is a highly stable element and does n't react with other.! Caustic soda is sodium hydroxide to form a blue precipitate of Copper – Copper a... In contact with one electron to fulfill its outermost shell and attain stability completing! Exhibit more than one valency is nothing but bonds for eg is 11 in. They cancel out forming balanced compound an ionic compound made up of....