Define atomic size. How does it vary in a period and in a group ?

Answer:

Atomic size is the distance between the centre of the nucleus of an atom and its outermost shell and the atomic radius is defined as theshortest distance between the atom’s nuclei and the outermost shell of the atom.

In general, the atomic radius decreases as we move from left to right in a period with an increase in nuclear charge of the element. The atomic radius increases when we go down a group because of the addition of extra shell.

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