Which of the following sets of quantum numbers represents the least energy of an atom ?

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n = 3, l = 0, m = 0, s = +1/2

n = 4, l = 0, m = 0, s = +1/2

n = 3, l = 2, m = 1, s = + 1/2

n = 3, l = 1, m = 1, s = +1/2

answer is A.

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Detailed Solution

Lesser the (n + l) value, lesser will be the energy,(n + l) = (3 + 0) = 3 in the first option which has least (n + l) value.

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