Question

hey guys...


plzz ans my question....

Answer 1

Hey dear here is your answer!!!!!

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Valency :- The valency of an element is determined by the number of outer shell(valence) electrons ...

For example :- C( carbon) it has 4 electron in its outermost shell , therefore it's valency is 4

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Valence electrons are the no. of electrons present in outermost shell , while valency is the no. least no. of electrons needed to stable the outermost shell...

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Atomic Mass -> Atomic mass is a characteristic of an atom that is a measure of its size. 

Atomic Number -> the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.

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Hope it helps u ..