1.

Which of the following does not contain number of neutrons equal to that of ._(18)^(40Ar

Answer»

`._(19)^(41)K`
`._(21)^(43)Sc`
`._(21)^(40)Sc`
`._(20)^(42)Ca`

Solution :`._(18)^(40)Ar` has `40 - 18 = 22` neutrons
While `._(21)^(40)Sc " has " 40 - 21 = 19` neutrons


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