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  4. Phosphide ion has the electronic structure similar to that of

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Q. Phosphide ion has the electronic structure similar to that of

The p-Block Elements - Part2

Solution:

$ P^{3-} = 1s^22s^22p^63s^23p^6$
$ Cl^- = 1s^22s^22p^63s^23p^6$
Both $P^{3-}$ and $Cl^-$ have 18 electrons each.