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9. (20Ca) calcium: 18? 2s 2p 3s 3p 3d?
10. (17CI) chlorine: 1s 2s 2px 2py2 2pz3s 3px? 3py24s?
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Sagot :

Explanation:

1) sodium 1s 2 2s 2 2p 6 3s 1 2) iron 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 6 3) bromine 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 5 4) barium 1s 2 ...