Which of the following is an isotonic pa...

Which of the following is an isotonic pair

A

`""_(19)^(40)K , ""_(20)^(40)Ca`

B

`""_(19)^(39)K, ""_(20)^(40)Ca`

C

`""_(18)^(33)Ar, ""_(18)^(40)Ar`

D

`""_(18)^(40)Ar, ""_(20)^(40)Ca`

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The correct Answer is:

B

Isotones have same number of neutrons.

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