1.

Which of the following sets of quantum numbers represents the 19^("th") electron of Cr (Z= 24)?

Answer»

`(4,1,-1,+1/2)`
`(4,0,0,+1/2)`
`(3,2,0,-1/2)`
`(3,2,-2,+1/2)`

Solution :ELECTRONIC CONFIGURATION of
`Cr (24) : 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 4s^(1) 3D^(5)`
So, `19^("th")` electron is present in 4s-orbital. For 4s orbital,
n = 4, l= 0, m = 0, s = `pm1//2`


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