Answer:
Step-by-step explanation:
Protons and neutrons are two subatomic particles.
- The make up the nucleus
- Most of the mass of the atom consists of them
- Their sum is the mass number of an atom
They are always found in the nucleus, regardless of the type of element.
Electrons are the other main subatomic particles, and they are found outside and surrounding the nucleus.
The best answer choice is A. Protons and neutrons are in the nucleus