| Term | Definition |
|---|---|
| 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 |
| Element | one of the basic substances that are made of atoms of only one kind and that cannot be separated by ordinary chemical means into simpler substances |
| Subscript | a distinguishing symbol (as a letter or numeral) written immediately below or below and to the right or left of another character |
| Molecule | the smallest possible amount of a particular substance that has all the characteristics of that substance |
