Q.

Which of the following sets of quantum numbers represents the highest energy of an atom

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a

n=3,   l=0,  m=0,  s=+1/2

b

n=3,   l=1,  m=1,  s=+1/2

c

n=3,   l=2,  m=1,  s=+1/2

d

n=4,   l=0,  m=0,  s=+1/2

answer is C.

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Detailed Solution

In the given all set of quantum numbers, n=3,   l=2,  m=1,  s=+1/2  has the highest energy of an orbital in an atom. If  n=3,   l=2 means it is 3d orbital. Therefore,  3d>4s>3p>3s.

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