A) 4, 3
B) 4, 4
C) 3, 3
D) 5, 4
Correct Answer: A
Solution :
\[Mn(25):[Ar]\underbrace{3{{d}^{5}}4{{s}^{2}}}_{Valence\text{ }shell\text{ }orbit}\] Hence, the principal quantum numbers of valence shell orbits are 3 and 4.
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