Question

1. identify the one particle the does not affect the atoms mass number. proton neutron electron 0 / 1 submissions used

Explanation:

The mass number of an atom is the sum of the number of protons and neutrons in its nucleus. Protons and neutrons have significant mass, while electrons have a negligible mass (about 1/1836 of a proton's mass) and do not contribute to the atom's mass number.

Answer:

Electron