First slide

Quantum mechanical model of the atom

Question

Which of the following sets of quantum numbers represents the 19th electron in chromium $(z = 24) ?$

Easy

A

4,0,0,1/2
B

$4, 1, - 1, 1 / 2$
C

$3, 2, 2, 1 / 2$
D

$3, 2, - 2, 1 / 2$

Solution

19^th electron of Cr goes to 4s orbital. Hence quantum numbers are 4, 0, 0, ±1/2.

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