The sum of protons and neutrons around the nucleus
- The sum of protons and neutrons in the nucleus
- The sum of protons and neutrons in the nucleus of an atom
- The sum of protons and neutrons in the nucleus is called
- The sum of protons and neutrons inside the nucleus
- The sum of protons and neutrons in the nucleus of an atom is called
- The sum of protons and neutrons inside the nucleus of an atom is called
- The sum of protons and neutrons in the nucleus of an atom is known as
- Neutron number