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Q.

Which one of the following set of quantum numbers is not possible for any of the19 electrons in the ground state of an atom with atomic number 19 ?

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a

n = 2, l = 1, m = 0

b

n = 3, l = 1, m = – 1

c

n = 2, l = 0, m = 0

d

n = 3, l = 2, m =  2

answer is D.

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Detailed Solution

K(Z = 19)…1s22s22p63s23p64s1

1s22s22p63s23p64s1(1,0)(2,0)(2,1)(3,0)(3,1)(4,0)

Thus n = 3, l = 2 is not possible

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