The mass number of an atom whose unipositive ion has 10 electrons and 12 neutrons is:

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Solution

The correct option is A 23
Number of electrons in ( $X^{+})$ = 10

Number of electrons in X = 11
Number of protons in X = 11
Number of neutrons in X = 12

Mass number = number of protons + number of neutrons

Mass number of X = 11+12 = 23
Therefore, mass number = 23

Hence, correct option is (a)

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