Question

four quantum number of element are n= 3 , l=2 m= 0 s = + 1/2 what is atomic number of element
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Answer 1

Answer:

Explanation:

First let us designate the ans.

n=3

3___

Now,l=2 ; that means d subshell.

3d__

m is given as 0

m =0 in d subshell,is only possible for dz.

So, 3d and for s=+1/2 means having 1 e- in 3d.

Thus,designation should somewhat be 3d^1.

Talking about entire electronic config.:

till 3d^1 ,-------- 1s^2  2s^2  2p^6 3s^2  3p^6 4s^2  3d^1

counting all the powers , we get atomic no. as 21.

ans should be 21.

I am not that sure about the answer. Pls crosscheck once.