Question

what is difference between valency and valence electrons​

Answer 1

VALENCY:

Is the ability of an atom to lose or gain electrons

VALENCE ELECTRONS:

Number of electrons present in the outermost shell

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Answer 2

The number of electrons in an atom is always the same as the number of protons, so atoms are electrically neutral over all. Atoms can loss or gain electrons. If an atom gains one or more electrons, it becomes a negativity changed ions.