1.

Which one of the following sets of ions represents the collection of isoelectronic species?

Answer»

`K^(+), Ca^(2+), Sc^(3+), Cl^(-)`
`Na^(+), Ca^(2+), Sc^(3+), F^(-)`
`K^(+), Cl^(-), Mg^(2+), Sc^(3+)`
`Na^(+), Mg^(2+), AL^(3+), Cl^(-)`

Solution :Isoelectronic species are those which have same NUMBER of electrons.
`K^(+)= 19 -1 = 18 , Ca^(2+) = 20 - 2 = 18`
`Sc^(3+) = 21 - 3 = 18 , C^(-) = 17 + 1 = 18`


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