Question

An ion M3+ contains 10 electron and 14 neutron. What is it's Mass number?

Answer 1

Since the Valency is +3, this means that proton is 3 more that the no. of electrons.

Thus No of Protons : 10+3 = 13

Mass no. : No. of Protons + No. of Neutrons

Thus, Mass no : 13 + 14 = 27

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