The electronic configuration of ytterbium (Z = 70) is 4f145s2 and that of lutetium (Z = 71) is 4f145d16s2 can be explained on the basis of

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the extra stability of the half- filled orbitals

the extra stability of the completely filled orbitals

the usual rules for the arrangement of electrons in their orbits

None of these

answer is C.

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Detailed Solution

Ytterbium and lutetium follow the usual rules for the arrangement in their orbits

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