Electron promotion rule is related to

1.	Electron promotion rule is related to
A.	\[2s\to 2p\]
B.	\[2s\to 3s\]
C.	\[2s\to 3p\]
D.	\[1s\to 2s\]
Answer» B. \[2s\to 3s\]

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Electron promotion rule is related to

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