Atoms

Inside an atom there is a nucleus containing protons and neutrons, Around the nucleus are shells containing electrons. Protons give off a positive charge whereas electrons give off a negative charge and neutrons give off no charge because they're neutral.

Inside an atom: Protons, Electrons, Neutrons, A nucleus and shells.

Proton: A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron.

Electron: A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

Neutron: A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

Keyword(s)

Atomic: Smaller than or occurring within an atom.

Around an atom there are shells containing electrons, These electrons give off a negetive charge of electricity. On the first shell of an atom there can only be 2 or less electrons whereas on any other shell there can be up to 8 electrons, Any left over electrons go on the last shell. On the periodic table the group of an atom depends on how many electrons are on the atoms outer shell, e.g. Carbon has 4 electrons on its outer shell and is therefore in group 4 on the periodic table.