CHEMISTRY HOMEWORK HELP?

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In the H atom the 2s orbital and 2p orbital are degenerate. In He the 2p orbital has a higher energy than the 2s orbital. The principle that accounts for this observation is
(A) Electron screening
(B) DeBroglie relationship
(C) Pauli exclusion principle
(D) Bohr’s theory
(E) Hund’s rule
 
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