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Number of species that are isoelectronic...

Number of species that are isoelectronic with `Ar` is.

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The correct Answer is:
5
`Ar(Z = 18)`
There are five species which has `18 e^(-)'s`.
i. `P^(3-)(15+3=18)` , ii. `S^(2-)(16+2=18)`
iii. `Cl^(ɵ)(17+1 = 18)` , iv. `K^(o+)(19-1 =18)`
v. `Ca^(2+)(20-2=18)`
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