Question

The sum of the protons and neutrons in an atom equals the?

nucleus number
atomic number
atomic mass
mass number

Answer 1

mass number

Step-by-step explanation:

The sum of the protons and neutrons in an atom equals the mass number of such an atom.

• Mass number is the mass of an atom.
• The mass of an atom is concentrated in the nucleus
• The particles in the nucleus are the protons and neutrons.

So;

Mass number = number of protons + number of neutrons.