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# Atomic Models: Ionization Energy

APCHEM-TAEQLB

Below are the ionization energies for magnesium:

$\text {Electron}$ $\text {Ionization Energy (kJ/mol)}$
1 737.7
2 1450.7
3 7732.7
4 10542.5
5 13630
6 18020
7 21711
8 25661
9 31653
10 35458
11 169988
12 189367.7

$\$
Based on the ionization energies provided, how could the number of electron energy levels be determined in a neutral atom of magnesium?

A

Periodic.

Significant increases in the ionization energy indicate there are three energy levels in a neutral atom of magnesium.

B

Periodic.

Significant increases in the ionization energy indicate there are four energy levels in a neutral atom of magnesium.

C

Periodic.

Significant increases in the ionization energy indicate there are 12 energy levels in a neutral atom of magnesium.

D

Ionization energies cannot be used to determine the number of levels in a neutral atom of magnesium.