define symbols ,valency.
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A chemical symbol denotes in short, a particular element or an atom of that element. ... Valency is the combining capability of an element. In other words, the number of electrons which an atom can gain or share or lose when a chemical reaction takes place defines its valency.
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Explanation:
Symbols - They are the short forms of elements E.g Fe, Na, K
Valency - It is the number of electrons lost, gained or shared by an atom during the formation of chemical bond.
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