The+Making+of+an+Atom

An atom is made out of Protons, Neutrons, and Electrons. Protons and Electrons make the nucleus while the Electrons circle the nucleus.

Electrons = atomic number Protons = atomic number Neutrons = atomic mass - atomic number

Here is an atom:

If an atom loses or gains an electron, it becomes an Ion. If an Oxygen atom loses an electron, it become O+1 but if it gains an Electron, it becomes O-1.