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In which one of the following pairs t...

In which one of the following pairs the two species are both isoelectronic and isotopic (atomic number Ca = 2 , Ar = 18 , K = 19 mg = 12 ,fe = 26 , Na=11 )

A

`.^(40)Ca^(2+)` and `.^(40) Ar`

B

`.^(39) K^(+)` and `.^(40) K^(+)`

C

`.^(56) Fe^(3+)` and `.^(57) Fe^(2+)`

D

`.^(23)Na` and `.^(24) Na^(+)`

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The correct Answer is:
B
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