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21-10-2022
Chemistry

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Determine which of the following electron configurations are not valid:
1.) 1s²2s²2p 3s 3p 4s²4d¹04p5
2.) 1s²2s²2p 3s³3d5
3.) [Ra] 7s²5f8
4.) [Kr] 5s24d105p5

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