Question

Valencies for acids and bases

Answer 1

Valency: The combining capacity of an atom is called its valency. Actually it can be defined as the number of electrons that an atom may lose (or) gain during a chemical reaction (or) the number of electrons shared. Ex: In water molecule H₂O (H - O – H)   Valency of Hydrogen is ‘ 1 ‘ (as it combines with Oxygen atom by  one single bond)  Valency of Oxygen is ‘2’ (as it combines with two Hydrogen atoms by two bonds)   Method to find Valency:                Find the nearest noble gas of the atom now check whether it has lose (or) gain electrons to get that noble gas configuration. The number of electrons that has been transferred (lost electrons or gained electrons) is called its valency. Ex: Sodium (Na) – belongs to IA group or group-1 (1- valency electron). Its nearest noble gas is Neon (Ne).It will lose one electron to get Neon (noble gas) – configuration. So valency of Sodium is 1. Chlorine (Cl) – belongs to VIIA group or group-17 (7- valency electrons). Its nearest noble gas is Argon (Ar).It will gain one electron to get Argon (noble gas) – configuration. So valency of Chlorine is 1. There are some elements which shows variable valency. Showing different oxidation states while participating in chemical reactions is called variable valency. Ex: Sulphur shows -2, +4, +6 oxidation states. So it posses variable valency.

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Answer 2

Answer:

correct SUPERB thanks