Why in lanthanam 5d is getting filled up instead of 4f? And how come it is called f block element?

Asked by mathini | 12th May, 2013, 10:15: PM

Expert Answer:

The energies of d- orbitals nad the next innershell f  orbitals are closely similar and therefore the order of filling the 4f - orbitals in the atoms shows quite irregularities.

Answered by  | 13th May, 2013, 10:26: AM

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