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Moderate

Second Ionization Energy 2

APCHEM-XIKANU

Which of the following elements has the highest second ionization energy?

A

$Na$

One electron is removed from a full 2p.

B

$Mg$

Both electrons are removed from a full 3s.

C

$Ca$

Valence electrons are removed from a full 4s.

D

$Rb$

One electron is removed from a full 4p.