What is found in the nucleus of the atom?

Protons, neutrons

Explanation:

Inside atom, the entire mass of it lies in nucleus.

So, we knew that mass of atom = no of protons + no of neutrons

hence from we understand, nucleus contain both protons and neutrons

Answer:The Nucleus: The Center of an Atom. The nucleus, that dense central core of the atom, contains both protons and neutrons. Electrons are outside the nucleus in energy levels. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge.