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# Ground State of an Ion

APCHEM-JVQDQL

An ion is an atom with an electric charge due to a loss or gain of an electron.

Which of the following is the electron configuration of a ground state of the most common alkali metal ion?

A

$1s^22s^2$

B

$1s^22s^1$

C

$1s^22s^22p^6$

D

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