The atom is made up of smaller particles, including protons, neutrons, and electrons. Protons are positively charged particles, electrons are negatively charged, and neutrons are uncharged.
Electrons orbit around the nucleus, protons, and neutrons are in the nucleus and are the ones that represent the mass of the atom.
Therefore, the correct answer will be:
First option:
Protons and neutrons are in the nucleus, with electrons orbiting the nucleus.