| A | B |
|---|
| valence | the capability of atoms to combine with other atoms based on the number of electrons in the outer most orbital |
| bond | the force of attraction that holds atoms or a group together in a molecule |
| element | a pure substance that cannot be broken down into simpler substances by chemical means |
| ion | an atom or group of atoms that has become electrically charged |
| isotope | an atom with an equal number of protons and different number of neutrons from other atoms of the same element |
| proton | a small positively charged particle in the nucleus of an atom |
| electron | a tiny negative charged particle that moves around the nucleus of an atom |
| neutron | a small particle in the nucleus of an atom, with no electrical charge |
| ionic bond | the force between two oppositely charged ions, formed through the transfer of one or more electrons |
| covalent bond | the force that holds two atoms together when the atoms share electrons |
| compound | a pure substance made of two or more elements chemically combined |
| atom | the basic particle from which all elements are made |
