Hund rule of maximum multiplicity & numericals

Hund rule of maximum multiplicity & numericals:

Hund rule of maximum multiplicity:
pairing of electron in various orbital of a subshell connot take place until each orbital contain ane electron.

Numericals:

1.what is the total capacity of electron of 4th principal energy shell ?
sol.
the no. of electron in a shell =2n^2
where n =4
than 2×(4) ^2=32

2.how many electron confit in principal shell n=2?
Sol.
no. of electron in a shell =2n^2
where n =2
than 2×(2) ^2= 8

3.how many electron can be accomodate in 4d subshell?
Sol.
d subshell have five orbital and each orbital can have 2 electron. so 4d subshell can accomodate 2×5= 10 electrons

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Radial probability distribution for p and d orbital, radial wave functions

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