Question

How is the mass number of an atom calculated? (1 point)
Responses

protons plus neutrons
protons plus neutrons

total number of protons
total number of protons

total number of electrons
total number of electrons

electrons plus neutrons

Answer 1

The mass number of an atom is calculated by adding the number of protons and neutrons together. Therefore, the correct response is:

**protons plus neutrons**