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Number Ionization Energy (kJ/mol)
First 1,087
Second 2,353
Third 4,620
Fourth 6,223
Fifth 37,831
Sixth 47,277

$\quad$

The table above shows the first six ionization energies for a second-period element.

Which of the following identifies the element and provides the BEST explanation?

A

Carbon, because it has six electrons.

B

Carbon, because it has four valence electrons.

C

Oxygen, because it has six electrons.

D

Oxygen, because it has four electrons in its $2p$ sublevel.

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