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Electron Configuration

APCHEM-XONK4P

Which of the following is the electron configuration of a transition metal?

A

$1s^22s^22p^63s^23p^64s^2$

B

$1s^22s^22p^63s^23p^6$

C

$1s^22s^22p^63s^23p^64s^23d^5$

D

$1s^22s^22p^63s^23p^64s^23d^{10}4p^2$