| A | B |
|---|
| 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 not created or destroyed, it only changes form |
| electron | negatively charged particles |
| nucleus | positively charged central part of the atom |
| proton | positively charged particles in the nucleus |
| neutron | an uncharged particle located in the nucleus of an atom |
| element | matter made of only one kind of atom |
| atomic number | the number of protons in the nucleus |
| isotopes | atoms of the same element that have different numbers of neutrons |
| mass number | number of protons, plus the number of neutrons it contains |
| atomic mass | weighted average mass of the isotopes of an element |
| metals | element that is bendable and can conduct electricity |
| nonmetals | usually gases or brittle solids and poor conductors of electricity |
| metalloids | element that has the characteristics of both metal and nonmetal |
| substance | matter that has the same composition and properties throughout |
| compound | substance whose smallest unit is made up of atoms of more than one element bonded together |
| mixture | two or more substances come together, but don't combine to make a new substance |
