The mass number and charge of this atom or ion is 24 and charge +2
What is mass number ?
The mass number is equals to the total number of protons and neutrons in a nucleus.
In the give question, The number of neutrons is a distractor.
Only the number of electrons versus the number of protons determines ionic charge. The charge of the ion is +2
Hence, The mass number and charge of this atom or ion is 24 and charge +2
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