The atom was once thought to be the smallest undividable unit of which matter consisted.
Today, we know that there are subatomic particles, and some of those particles in turn consist of quarks. In chemistry though, we usually care only about the broader subatomic constituents, such as protons, neutrons, and electrons.
In this section, we will go through the basics of the atom, starting with the Bohr atomic model, which can be used to explain many chemical phenomena.
The next article in the series is about the Bohr atomic model.