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Physics, 20.04.2021 19:50 fzzyy

These electron configurations are NOT valid, determine what is wrong with them: 19) 1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p5

20) 1s2 2s2 2p6 3s2 3d5

21) [Ra] 7s2 5f8

22) [Xe]

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