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Q.

Electron occupies the available orbital singly before pairing in any one orbital occurs, it is

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a

Heisenberg's principle

b

Hund's Rule

c

Prout's hypothesis

d

Pauli's exclusion principle

answer is B.

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Detailed Solution

Hund's rule: Every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.

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