Question

The atom is the basic building block for all matter in the universe. atoms are extremely small and are made up of a few even smaller particles. the basic particles that make up an atom are electrons, protons, and neutrons. atoms fit together with other atoms to make up matter.

Answer 1

Yes, atom is building block of matter in the whole universe. And atom is made up up of three fundamental particles named Electron, Proton and Neutron.
Electron is negatively charged. Proton is positively charged whereas Neutron is neutral.