Final answer:
Atoms are made up of subatomic particles: electrons, protons, and neutrons, with electrons having a negative charge, protons a positive charge, and neutrons being neutral.
Step-by-step explanation:
The model represents an atom and its constituent subatomic particles. Atoms, which are the fundamental building blocks of molecules found in the universe, are composed of electrons, protons, and neutrons. The electron is a negatively charged particle represented as e-. The proton is a positively charged particle, denoted as p or p+, and the neutron has a similar mass to the proton but no charge, and it is denoted as n or n°. In an atom, the protons and neutrons form the nucleus at the center, while electrons orbit this nucleus.