Question

define-valency & atomic size​

Answer 1

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Valency:-the number of electrons gained or lost or shared to attain the octet in the outermost shell ,gives the combining capacity of the element that is,its valency.

Atomic Size"-Atomic size, which is also known as atomic radius, is defined as the distance between the centre of nucleus and the outermost or valence shell.

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Answer 2

Here's your answer.

VALENCY:

The valency of an element is determined by the number of electrons present in the outermost she'll of its atom.

ATOMIC SIZE:

The distance between the centre of the atom and the outermost shell of the atom is called atomic size.