Atoms, Elements, and Compounds

Atomic Mass

Mass of an element; equal to the number of protons and neutrons in an atom's nucleus

Proton

A subatomic particle fundamental to all matter, existing in the nucleus, has a positive charge and almost equal in mass to a neutron

Electron

A subatomic particle fundamental to all matter; existing in orbit around the nucleus of an atom. With a NEGATIVE charge

Neutron

A subatomic particle, fundamental to all matter except hydrogen, that exists in the nucleus and has the same mass as a proton (NEUTRAL)

Compound

A substance composed of 2 or more elements chemically bonded

Diatomic

Containing two atoms

Elements

Substances made up of 1 type of atom

Atomic Number

The number of protons and neutrons in the nucleus of an atom

Shell

The path surrounding the nucleus of an atom in which electrons are normally located

Nucleus

The positively charged center of an atom that contains both the protons and neutrons of an atom

Atomic Weight

The relative mass of each element

Molecule

The smallest unit of a pure substance that consists of 2 or more atoms held together by a chemical bond

Atom

The smallest unit of an element; retains chemical properties of an element