Question

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

Answer 1

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Atomic size is the distance between the centre of an atom to the outermost shell.

Atomic size decreases across a period since an extra electron is added in same subshell increasing effective nuclear charge, and thus nucleus attracts subshell closer decreasing atomic size.

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Answer 2

Explanation:

Atomic size is the distance between the centre of an atom to the outermost shell.

Atomic size decreases across a period since an extra electron is added in same subshell increasing effective nuclear charge, and thus nucleus attracts subshell closer decreasing atomic size.