How to find quantum no. Of highest energy electron of sodium?
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The spin is either +1/2 or -1/2. Because of Hund's rule, the +1/2 spins are filled up first. The m states are filled from lowest to highest. So, the first six p-states filled are in the following order:
1) m = -1, s = 1/2
2) m = 0, s = 1/2
3) m = 1, s = 1/2
4) m = -1, s = 1/2
5) m = 0, s = 1/2
m = 1, s = 1/2
Since the 15th electron is the third filled for the 3p state (n = 3, l = 1), the number for the highest electron of Phosphorous is
n = 3, l = 1, m = 1, s = 1/2
1) m = -1, s = 1/2
2) m = 0, s = 1/2
3) m = 1, s = 1/2
4) m = -1, s = 1/2
5) m = 0, s = 1/2
m = 1, s = 1/2
Since the 15th electron is the third filled for the 3p state (n = 3, l = 1), the number for the highest electron of Phosphorous is
n = 3, l = 1, m = 1, s = 1/2
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