What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons?

Answer Details

The mass number of an element is the sum of the number of protons and neutrons in the nucleus of an atom. Given that the atom of the element has 10 protons and 12 neutrons, the mass number of the element would be: Mass number = Number of protons + Number of neutrons Mass number = 10 + 12 Mass number = 22 Therefore, the answer is: 22.