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JEE Main Chemistry question

ChemistryStructure of AtomJEE Main

The 5 valence electrons of P are labelled as

A, B, C, D, E ()

The spin quantum numbers of electron B and E are . For how many pair(s) of electrons, three of the quantum numbers are identical?

Answer: 5

Solution

With and B, E both given (so, by Hund's rule, all three unpaired electrons have , and A is the paired partner of B with ), the four quantum numbers are: A: ; B: ; C:

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Question ID VK-133032