| A | B |
|---|
| natural elements | the 94 elements that occur in nature |
| synthetic elements | man made elements that are unstable; made in the lab |
| compound | Two or more elements joined together by a bond |
| alchemy | This fictious belief that gold could be made from a chemical reaction |
| charge | electrical force exhibited as either a positive or a negative charge |
| protons | The positively charged nucleon inside the nucleous |
| neutrons | the neutral necleons inside the nucleous |
| electrons | the negatively charged particle the moves around the outside of the nucleus. |
| atomic number | the number of protons in an atom |
| nucleus | the central portion of an atom containing protons and neutrons. it usually doesn't change |
| mass number | the weight of an atom based on proton and neutron numbers |
| valence electrons | the outermost electrons that form bonds |
| isotopes | elements of the same atom but with a different number of neutrons |
| covalent bond | the sharing of valence electrons |
| ionic bonding | a bond based on a positive and negative attraction |
| anion | negative ion |
| cation | positive ion |
