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B
An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers
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C
Total orbital angular momentum of electron in 's' orbital is equal to zero
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D
The value of m for d2z is zero
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Solution
The correct option is A The electronic configuration of N atom is: According to Hund's Rule of maximum multiplicity, the correct electronic configuration of N-atom is so option a violates Hund's rule