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Solution


Q.

Given,

(A)  n=5, mℓ=-1

(B)  n=3, ℓ=2, mℓ=-1, ms=+12

The maximum number of electron(s) in an atom that can have the quantum numbers as given in (A) and (B) respectively are:         [2026]
1 4 and 1  
2 26 and 1  
3 8 and 1  
4 2 and 4  

Ans.

(3)

(A) n=5

l=0    ml=0

l=1    ml=-1,0,1⇒2 electrons

l=2    ml=-2,-1,0,1,2⇒2 electrons

l=3    ml=-3,-2,-1,0,1,2,3⇒2 electrons

l=4    ml=-4,-3,-2,-1,0,1,2,3,4⇒2 electrons

Total number of electrons = 8

(B) n=3, l=2, ml=-1, ms=+12⇒ only 1 electron is possible