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Q.

A certain positive ion A+2 has 22 neutrons and 18 electrons. What is the mass number of most abundant isotope of A?

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a

42

b

38

c

none of these

d

40

answer is C.

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Detailed Solution

Isotopes are members of the same element's family but have variable numbers of neutrons despite having the same number of protons.

The most prevalent isotope of A has a mass number of 40.

 

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