| A | B |
|---|
| atom | smallest unit of an element that can combine chemically with other elements. |
| chemical formula | expression used to identify compounds by showing the kind and number of atoms. |
| chemical symbol | one, two, or three letter abbreviation for an element |
| compound | composed of chemically joined elements |
| density | mass per unit volume |
| electrolysis | chemical change that occurs when an electric current passes through a liquid |
| element | substance that cannot be broken down into simpler substances by chemical means. |
| mixture | material containing different substances that have not been joined chemically. |
| molecule | smallest unit of a substance that has all the properties of that substance. |
| precipitate | insoluble solid that separates from a solution. |
| product | substance resulting from a chemical reaction. |
| reactant | substance entering into a chemical reaction. |
| scientific law | general statement describing the behavior of nature. |
| atomic mass | average of the masses of an element's isotopes |
| atomic number | number of protons |
| chemical bond | force holding atoms together |
| covalent bond | bond formed by sharing electrons |
| electron | negatively charged particle in an atom |
| ionic bond | bond formed by electron transfer |
| ions | formed when electrons are lost or gained |
| isotopes | atoms with the same number of protons and different numbers of neutrons |
| mass number | number of neutrons plus protons |
| metal | element on left side fo periodic table |
| neutron | atomic particle with no charge |
| nonmetal | element on right side of periodic table |
| oxidation number | indicates what charge an atom has |
| periodic table | arrangement of elements according to their properties |
| proton | positively charged particle in an atom |
