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How many electron in an atom may have th...

How many electron in an atom may have the following quantum number ?
a. `n = 4, m_(s) = -(1)/(2)`
b. `n = 3,l = 0`

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The decrerasing order of energy for the electrons represented by the following sets of quantum number is : 1. n = 4,l = 0,m = 0,s = +- 1//2 2. n = 3,l = 1,m = 1,s = - 1//2 3. n = 3,l = 2,m = 0,s = + 1//2 4. n = 3,l = 0,m = 0,s = - 1//2