Asked by Balaji J | 31st Oct, 2013, 06:40: PM

Expert Answer:

Valency is the number of hydrogen atoms which can combine with one atom of the element forming a compound. The valency of all metals is considered as positive and the valency of all non-metals is considered negative.

An ion is an atom that has acquired a net electric charge by gaining or losing one or more electrons. Ion that has a net negative charge is called anion and an ion that has a net positive charge is called cation. 

Answered by Karishma Kapoor | 5th Nov, 2013, 11:05: AM

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