Question

1. choose the best answer.

the center of an atom that contains protons and neutrons is called a(n)
proton
neutron
electron
nucleus

Explanation:

An atom consists of a nucleus (containing protons and neutrons) and electrons orbiting around it. A proton is a positively - charged particle, a neutron is a neutral particle, and an electron is a negatively - charged particle that orbits the nucleus. The nucleus is the central part of the atom where protons and neutrons are located.

Answer:

nucleus