Periodic Trends

AP Chemistry· difficulty 4/5

The graph plots successive ionization energies of a neutral, ground-state atom. A large jump occurs between IE3 and IE4.

The element is most likely:

A
$Silicon (group 14)$
B
$Magnesium (group 2)$
C
$Phosphorus (group 15)$
D
$Aluminum (group 13)$
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Explanation

A jump after the third ionization shows three valence electrons; removing the 4th means breaking into a noble-gas core. Hence Al (group 13).

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