Question

how is the mass number calculated for an atom involved in nuclear fusion? (1 point) it is the number of electrons. it is the number of neutrons. it is the number of protons plus neutrons. it is the number of protons plus electrons.

Explanation:

The mass number of an atom is the sum of the number of protons and neutrons in the nucleus. Electrons are not included in the calculation of the mass number as they have negligible mass compared to protons and neutrons.

Answer:

It is the number of protons plus neutrons.