| Term | Definition |
|---|
| substance | matter that has the same composition and properties throughout |
| compound | a substance made of atoms of more than one element bound together |
| mixture | when two or more substances come together but don't combine to make a new subtance |
| matter | anything that has mass and takes up space |
| atom | a small particle that makes up most types of matter |
| law of conservation of matter | states that matter is neither created nor destroyed, only changed in form |
| electrons | negatively charged particles |
| nucleus | the positively charged dense center of an atom |
| protons | Positively charged particles |
| neutrons | uncharged particles |
| element | matter made of up only on kind of atom |
| atomic number | the number of protons in the nucleus of each atom of that element |
| isotopes | which are atoms of the same element that have diffrent numbers of neutrons |
| mass number | number of protons plus the number of neutrons it contains |
| atomic mass | is the weighted average mass of the isotopes of an element |
| nonmetals | are elements that are usually dull in appearance |
| metals | generally have a shiny or metallic luster and are good conducters of heat and electricity |
| metalloids | elements that have characteristics of metals and nonmetals |
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