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Which of the following choices shows the ground state electron configuration of a halogen?

A

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

B

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

C

$1s^22s^22p^62d^{10}3s^23p^5$

D

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

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