| A | B |
|---|
| atom | smallest unit of an element |
| atomic mass number | the number of protons and neutrons in the nucleus of an atom |
| atomic number | the number of protons in the nucleus of an atom |
| compound | a substance that results when the atoms of two or more elements are chemically combined |
| element | a substance that has a characteristic set of physical and chemical properties |
| igneous rock | a rock formed from cooled and hardened magma |
| matter | anything that has mass and takes up space |
| metamorphic rock | a rock formed from other rocks as a result of intense heat, pressure, or chemical processes |
| mineral | a natural, inorganic, crystalline solid found in earth's crust |
| molecule | the smallest complete unit of a substance consisting of two or more atoms chemically combined |
| rock | a lump or mass of hard consolidated mineral matter |
| sedimentary rock | a rock formed from hardened deposits of sediment |
