Atom
The smallest particle of an element.
Gas
Molecules have very rapid, random motion.
Mixture
A combination of two or more substances that are easy to separate.
Symbol
Something that stands for something else.
Compound
They are made up of two or more elements.
Liquid
Molecules have rapid, random motion.
Periodic Table
A chart that organizes them by their families, atomic numbers, and many other properties.
Matter
Anything that takes up space and has mass.
Element
They are made up of only one kind of atom.
Solid
Molecules vibrate in place.
Proton
A subatomic particle found in the nucleus of every atom.
Solutions
A combination that can't be taken apart easily.