Choose the correct option.
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

The explanation for the correct option:
(a) Mass number = Number of protons + Number of neutrons
As a unipositive ion is formed by the loss of an electron, therefore the atom will have one electron more than its ion.
Given, that the unipositive ion has 10 electrons. Therefore the number of electrons in its neutral atom is 11.
In the neutral atom, Number of protons = Number of electrons
Accordingly, Number of protons= 11
Given, Number of neutrons= 12
Therefore, Mass number= 11+ 12= 23
Hence, option (a) is correct.

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