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Sodium in all its compounds forms the Na+ ion.

Its electron configuration is the same as of noble gas Ne:

(Na+) = (1s2, 2s2 2p6, 3s0)

Na2+ would have the following electron configuration: 1s2, 2s2 2p5

This is not a noble gas configuration and requires a lot of energy to remove the 2nd electron out off the 2px orbital just after the 1st removal from its 3s orbital. It only is observed for example as a transient species when sodium vapour is irradiated with strong laser light.

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