Question

Why do both atomic size and ionic size increase as you move down a group?

Answer 1

Basically, as we move down the periodic table, the size of the nucleus increases, and concomitantly more electrons are present to "shield" the valence electrons from the charge. ... If there are many electrons, its harder to rope them up via electron charge than when there are less.

Answer 2

Basically, as we move down the periodic table, the size of the nucleus increases, and concomitantly more electrons are present to "shield" the valence electrons from the charge. ... If there are many electrons, its harder to rope them up via electron charge than when there are less.

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