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Q.

Number of electrons with l=1 and m=-1 in the element with Z= 24 are

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a

6

b

4

c

8

d

2

answer is B.

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Detailed Solution

l=1 means p subshell CrZ=24-1s22s22p63s23p64s13d5; When l=1p-subshell; m=-1,0,+1;  Thus for every 'p' subshell there are two electrons with m=-1. Therefore number of electrons with l=1 and m=-1 are four(Two electrons each in 2p and 3p subshell)
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Number of electrons with l=1 and m=-1 in the element with Z= 24 are