Chemistry 9701 · AS & A Level · The Periodic Table: chemical periodicity

The Periodic Table: chemical periodicity — practice question

Sir Humphrey Davy discovered boron, calcium, magnesium and sodium. Of these elements, which one has the second-smallest atomic radius within its group and the third-lowest first ionisation energy in its period?

Aboron
Bcalcium
Cmagnesium
Dsodium

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