Which elements have two electron shells?
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Kcal/moleee, e, eqsodium1s 2s 2p 3s111810911653he10034501002526magnesiumaluminium1s 2s 2p 3s1s 2s 2p 3s 3pwe27670411ce20 = 1what is the electron configuration when the valence electrons are removed from each of the elements listed in thchart? 1s22s22p3s21s 2s 2p60 15²2521s22s 2p 3s
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