Question

in chromium (Cr_24) the no of electrons with azimuthal quantum no , l = 1 and 2 are respectively:
a. 12 and 4
b. 12 and 5
c. 16 and 4
d. 16 and 5
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Answer 1

Sol.    = 1 p and  = 2 for d.

 

       Now Cr has configuration

 

       1s2 2s2 2p6 3s2 3p6 3d5 4s1

 

       Hence there are 12, p-electrons and 5, d-electrons