Front

Basic building block of chemistry; smallest unit of matter with chemical properties.

Back

atom

Front

Material substance constituting the universe, occupying space and possessing rest mass.

Back

matter

Front

Measure of matter in an object

Back

mass

Front

A substance that cannot be separated or broken down by chemical means.

Back

element

Front

A stable subatomic particle in all atomic nuclei with a positive charge equal to that of an electron but opposite in sign.

Back

proton

Front

Subatomic particle with mass similar to a proton, no electric charge, found in all atomic nuclei except ordinary hydrogen.

Back

neutron

Front

Firm and stable in shape; not liquid or fluid.

Back

Solid

Front

A substance that expands to fill its container, with no fixed shape or volume.

Back

gas

Front

A substance that flows freely, has constant volume, and resembles water or oil.

Back

liquid

Front

Ratio of mass to volume of a substance

Back

density