The mass of electrons is very small compared to protons and neutrons. Since a nucleus contains protons and neutrons, most of the mass of an atom is concentrated in its nucleus. Protons and ...
Two presenters use animations to show how protons, neutrons and electrons make up atoms. They explain the relative masses, sizes, locations and charges of these subatomic particles. Introduce ...
When two hydrogen atoms and an oxygen atom get close enough, the electron from each atom feels an attraction from the protons in the other atom's nucleus. This attraction pulls the atoms together. The ...
At its core, an atom is a nucleus surrounded by a cloud of electrons. But a closer look reveals that this nucleus comprises protons and neutrons, which are made up of particles called quarks and ...