The atom of an element has 20 protons, 20 electrons, and 20 neutrons:
What is the mass number of the element?

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Solution

Mass number(A)- The number of protons and neutrons combine to give us the mass number of an atom.
Atomic number(Z)- The total number of protons in the nucleus of an atom gives us the atomic number of that atom.
Mass number = number of protons + number of neutrons
The mass number for the given element will be 40.

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