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प्रश्न
Write down the electronic configuration of Pm3+.
उत्तर
Pm3+ (61): 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s0 5d0 4f4
Or, [Xe]4 f4
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