| A | B |
|---|
| element | A pure substance that can't be broken down into simpler substances |
| atoms | the smallest particle of matter |
| pure substance | substances made of only one type of particle |
| physical propeties | boiling & melting pts., solubility, density |
| chemical properties | flammability and reactivity |
| metals | the left side of the periodic table |
| metal propeties | shiny, good conductors, malleable, ductile |
| nonmetals | the right side of the periodic table |
| nonmetal propeties | poor conductors, dull, brittle, unmalleable |
| malleable | can be hammered into different shapes |
| mercury | metal which is liquid at room temperature |
| graphite | nonmetal which can conduct electricity |
| compound | form when elements chemically combine |
| chemical name for water | hydrogen oxide |
| chemical name for salt | sodium chloride |
| metal state at room temperature | mostly solids |
| nonmetal state at room temperature | mostly gases |
| synthesis | joining together simpler substances to make complex ones |
| decomposition | breaking down of complex substances into simpler ones |
| oxygen | most common element in the human body |
| silicon | second most common element in the Earth's crust |
| molecule | two or more atoms joined by chemical bonds |
| diatomic molecule | two atoms joined together |
| unit used to measure the size of atoms | nanometre |
| ion | particle with an electric charge |
| when atoms join to form compounds | chemical reaction |
