Question
Asked Mar 12, 2020
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Two possible electron configurations
for an Li atom are shown here. (a) Does
either configuration violate the Pauli
exclusion principle? (b) Does either
configuration violate Hund’s rule? (c)
In the absence of an external magnetic
field, can we say that one electron configuration
has a lower energy than the
other? If so, which one has the lowest
energy?

Configuration A
1L
1s
2s
Configuration B
11
1s
2s
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Configuration A 1L 1s 2s Configuration B 11 1s 2s

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