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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


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?


Carbon, because it has six electrons.


Carbon, because it has four valence electrons.


Oxygen, because it has six electrons.


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

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