Set of quantum numbers is correct for the 19th electron, Chemistry

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Which of the following set of quantum numbers is correct for the 19th electron of chromium:

           n             l               m            s

(a)      3              0              0              1/2

(b)      3              2              - 2          1/2

(c)      4              0              0              1/2

(d)     4              1              -1           1/2

Ans:   4              0              0              1/2

 


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