| A | B |
|---|
| Atom | the smallets particle of an element that has the same properties of the element |
| Atomic Number | the number of protons in the nucleus of an atom |
| Atomic Mass Number | the total number of protons + nuetrons |
| Atomic Mass Unit | a unit of measurement ussed to measure the masses of particles in atoms |
| Nucleus | the central core of an atom |
| Nucleaus contains? | protons and nuetrons |
| proton | small, positively charged particle in the nucleus of an atom |
| neutron | small, uncharged particle in the nucleus of an atom |
| electron | tiny negatively charged particle outside nuceus of atom |
| valience electron | electrons fartherest away from nucleus |
| valience electrons are involved in this | chemical reaction |
| electon dot diagram | representation of the number of valence electrons using dots |
| periodic table | arrangment of elements in order of increasing atomic number |
