Which of the following does not contain a num | vedclass

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(C) The number of neutrons in an atom is calculated as $A - Z$,where $A$ is the mass number and $Z$ is the atomic number.For $_{18}^{40}Ar$,the number

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$_{21}^{40}Sc$

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(C) The number of neutrons in an atom is calculated as $A - Z$,where $A$ is the mass number and $Z$ is the atomic number.For $_{18}^{40}Ar$,the number of neutrons is $40 - 18 = 22$.Now,let us calculate the neutrons for each option:$A) _{19}^{41}K$: $41 - 19 = 22$ neutrons.$B) _{21}^{43}Sc$: $43 - 21 = 22$ neutrons.$C) _{21}^{40}Sc$: $40 - 21 = 19$ neutrons.$D) _{20}^{42}Ca$: $42 - 20 = 22$ neutrons.Thus,$_{21}^{40}Sc$ does not have $22$ neutrons.

Which of the following does not contain a number of neutrons equal to that of $_{18}^{40}Ar$?

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