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Moderate

Determination of Element by Ionization Energy Data

APCHEM-EOTZDE

Based on the ionization energies listed below, which of the following is likely the unknown element?

Unknown Element Ionization Energy (kJ/mol)
1st 737.7
2nd 1450.7
3rd 7732.7
A

$Na$

B

$Mg$

C

$Al$

D

$Si$