Question

Define (a) valency (b) valence electron (c) atomicity​

Answer 1

Answer:

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell. ... D - if the valencies can be simplified, divide them both by the smaller of the two numbers.

Definition of valence electron

: a single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of the atom.

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(c) atomicity​

: the number of replaceable atoms or groups in the molecule of a compound.

Explanation:

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