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Which one of the following groupings rep...

Which one of the following groupings represents a collection of isoelectronic species

A

`K^(+), Cr, Mg^(2+), Sc^(3+)`

B

`Na^(+), Ca^(2+), Sc^(3+), F^(-)`

C

`K^(+), Ca^(2+), Sc^(3+), CI^(-)`

D

`Na^(+), Mg^(2+), AI^(3+), CI^(-)`

Text Solution

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The correct Answer is:
C
Which one of the following ………..
Atomic number of K, Ca, Sc and CI are 19, 20, 21 and 17 respectively.
`K^(+) = 18e, Ca^(2+) = 18e, Sc^(3+)= 18e, Cr = 18e`
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