1. Chemical Symbols of Elements 2. Valency 3. Electrovalent (Ionic) Bond and Electrovalency 4. Chemical Formula 5. Electrovalency for Some Monoatomic Negatitve Ions 6. Polyatomic Radicals/Ions (For Ionic Compounds) 7. Negative Ions (Acid radicals) Valency Table 8. Hit and Trial Method (Inspection Method) 9. Complete Chemical Equation 10. Ionic Equations 11. Solubility Rules 12. Broad Classification of Inorganic Reactions 13. Practice Questions 14. Answers to SAQs 15. Answers to Practice Questions
When two or more elements combine to form compounds, the combining capacity of an atom of an element with other atoms is determined from its ‘valency’. # Old definition of Valency: - *It is the number of H atoms with which one atom of an element can combine.* Hydrogen atom was taken as standard because it is monovalent/univalent (valency = 1). For example, in methane (CH~4~), carbon has a valency of 4 (tetravalent); in ammonia (NH~3~), nitrogen has a valency 3 (trivalent) and in H~2~O, oxygen has a valency 2 (divalent/bivalent) and in HF/HCl/HBr/HI, the valency of each halogen atom (F/Cl/Br/I) is 1. So halogens (F/Cl/Br/I) are also monovalent (valency = 1) like H. - *Valency of an element can also be defined as the number chlorine or other monovalent atoms with which one atom of the element can combine.* In phopshorous pentachloride (PCl~5~), P has a
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