1.

Write down the electronic configuration of i. Pm3+ ii. Ce4+ iii. Lu2+

Answer»

i. Pm3+ = 1s2 2s2 2p6 3s2 3p6 3d104s2 4p6 4d105s2 5p6 4f4 .

ii. Ce4+ = 1s2 2s2 2p6 3s2 3p6 3d104s2 4p6 4d105s2 5p6 .

iii. Lu2+ = 1s2 2s2 2p6 3s2 3p6 3d104s2 4p6 4d105s2 5p6 4f145d1 .



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