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Why zinc,cadmium and mercury are not included in d block ?
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Why zinc,cadmium and mercury are not included in d block ?
According to Aufbau principle, electron enters lower energy orbital first. The energy of an orbital can be determined by sum of principal quantum number and the azimuthal quantum number. The orbitals with lower sum get filled first. In case of tie, the orbital with lower principal quantum number is filled first. In Zn, Cd and Hg; the last electron is filled in (n-1)d-orbital and not ns-orbital.
For 3d:
n=3, l=2
n+l=5
For 4s:
n=4, l=0
n+l=4

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