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Element
A substance that cannot be separated or broken down into simpler
substances by chemical means.
Compound
A substance made up of atoms of two or more different elements
joined by chemical bonds.
Chemical Symbol
A one-, two-, or three-letter abbreviation of the name of an
element.
Chemical Formula
A combination of chemical symbols and numbers to
represent a substance.
Atom
The smallest unit of an element that maintains the properties of that
element.
Molecule
A group of atoms that are held together by chemical forces; a
molecule is the smallest unit of a compound that keeps all the properties of that
compound.
Periodic Table
An arrangement of the elements in order of their atomic
numbers such that elements with similar properties fall in the same column, or
group.
Pure Subtance
A sample of matter, either a single element or a single
compound, that has definite chemical and physical properties.
Structure
What something looks like or how its made.
Function
What something’s purpose is or what it does
