Atoms composed of what?

Answer 1

Atoms have three subatomic particles; viz., protons, neutrons and electrons.

The protons, and neutrons are in the nucleus of the atom and are collectively named as 'nucleons'. Electrons are in energy shells outside and around the nucleus.

Atoms with a different number of protns and different elements.

Answer 2

Atoms are composed of a core of protons and neutrons, surrounded by a "cloud" of electrons that fill differently levels of the electron cloud.

Answer 3

broken question, may be electrons, protons, neutreons