Odpowiedź C, ponieważ:
Cl-: 1s2 2s2 2p6 3s2 3p6
Na+: 1s2 2s2 2p6
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Odpowiedź C, ponieważ:
Cl-: 1s2 2s2 2p6 3s2 3p6
Na+: 1s2 2s2 2p6