1.

Which of the following does not contain number of neutrons equal to that of `._(18)^(40Ar`A. `._(19)^(41)K`B. `._(21)^(43)Sc`C. `._(21)^(40)Sc`D. `._(20)^(42)Ca`

Answer» Correct Answer - C
`._(18)^(40)Ar` has `40 - 18 = 22` neutrons
While `._(21)^(40)Sc " has " 40 - 21 = 19` neutrons


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