the subshell electronic configuration of an element is given in two way
1) 1s² 2s² 2p6 3s² 3p6 3s² 4s²
2) 1s² 2s² 2p6 3s² 3p6 3d5 4s¹
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Answer:
2 is correct
Explanation:
bc after 3s2, 3d will be filled
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