How is the mass number calculated for an atom involved in nuclear fusion?(1 point) Responses It is the number of electrons. It is the number of electrons. It is the number of protons plus neutrons. It is the number of protons plus neutrons. It is the number of protons plus electrons. It is the number of protons plus electrons. It is the number of neutrons.
1 answer
It is the number of protons plus neutrons.