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On the basis of quantum number, which pe...

On the basis of quantum number, which period of the periodic table should have 32 elements.

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According to Aufbau principle, the electrons occupy in increasing order of energies, therefore in the sixth period, electrons can be filled in only `6s`,`4f`,`5d`, and `6p` subshells whose energies increase in the order:
`6slt4flt5dlt6p`
Total electrons in `6th` period
`=6s^(2)+4f^(14)+5d^(10)+6p^(6)`
`=(2+14+10+6)=32`
Hence, `6th` period has `32` elements.
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