| A | B |
|---|
| atom | the smallest unit of an element that contains all the properties of the element, they are the building blocks of matter |
| element | basic chemical substances from which all matter is made, it cannot be broken down into simpler substances |
| electron | a subatomic particle with a charge of -1 |
| proton | a subatomic particle with a charge of +1, this particle defines the identity of the atom |
| neutron | a subatomic particle with a neutral charge (0) |
| matter | anything that has mass and takes up space |
| isotopes | – two or more forms of an atom that contain the same number of protons but a different number of neutrons |
| ion | an atom that contain the same number of protons but a different number of electrons, the atom has either gained or lost electrons |
| cation | an atom that has lost electrons and has a positive charge |
| anion | an atom that has gained electrons and has a negative charge |
| orbital | a region in an atom where there is a high probability of finding electrons |
| subatomic particle | any particles found within the atom |
| atomic number | the number of protons in the nucleus of an atom |
| atomic mass/weight | the number of protons and neutrons in the nucleus of an atom |
| nucleus | the positively charged center of an atom containing the protons and neutrons |
| quark | subatomic particles found within the protons and neutrons of an atom |
| valence | The outermost energy level or shell in an atom |
| AMU | atomic mass unit |
| neutral | the overall charge of an atom |
| electron cloud | The region surrounding the nucleus of an atom where electrons are found. |
