1.

How many unpaired electrons are there inYb2+, Ce4+", Eu2+ and Tb4+ ions?​

Answer»

Answer:

The ORDER of filling the orbits is, 1s,2s,2p,3s, 3P ,4s ,3D ,4p ,5s , 4d ,5p ,6s ,4f, 5d ,6p ,7s.:

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