How does the size of the elements vary as we move across the periods

1.	How does the size of the elements vary as we move across the periods
Answer» (i) Atomic size increases as we move from top to bottom because each time one new shell is added and electrons in the outermost shell move away from the nucleus.(ii) Atomic size decreases across the period, as electrons are added in the same shell, effective nuclear charge increases and thus, atomic size decreases.

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