Question

what are the two main parts of which an atom is made up of

Answer 1

Nucleus and energy levels

Answer 2

Atoms are the basic building blocks of ordinary matter. Atoms can join together to form molecules, which in turn form most of the objects around you.

Atoms are composed of particles called protons, electrons and neutrons. ...

Protons and neutrons are both composed of other particles called quarks and gluons