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 B
No. of electrons in the uni positive ion $=$ 10
Thus, no. of electrons in the neutral atom $=$ 11
No. of protons $=$ no. of electrons $=$ 11
No. of neutrons $=$ 12
As mass no. $=$ no. of protons + no. of neutrons $=$ 11 + 12 $=$ 23.

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