Question

Define valency atomic size. Give brief answer.

Answer 1

valency is the number of electrons, protons in all the shells of the atom.

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Answer 2

Valency is the combining capacity of an atom of an element and it is number of electrons which an atom donates or gains in a chemical reaction.

Valency remains same down a group and across a group it first increases and then decreases.

Atomic size is the atomic radius and it is defined as the distance between the centre of nucleus and the outermost or valence shell.

Atomic size increases down a group and increases across the period.