The statement that the total mass of an atom of nitrogen is known as the atom's mass number is false.
The total mass of an atom of an element is known as its atomic mass. This is the sum of the masses of protons and neutrons in the atom. The mass number is the sum of the number of protons and neutrons in the atom.
The mass of the atom depends on only two particles, the protons and the neutrons. The electrons have a negligible mass. Hence, the statement that the total mass of an atom of nitrogen is known as the atom's mass number is false.
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