Question

The mass number of an atom is obtained by totaling the number of _____ and _____.

A) electrons and protonselectrons
B) neutronsprotons and neutrons
C) neutrons and isotopes

Answer 1

the sum of protons and neutrons inside an atom is your answer

Answer 2

Mass number is the sum of protons and neutrons inside an atom.

Atomic mass = no. of protons + no. of neutrons