| A | B |
|---|
| Atom | smalles particle of an element |
| Atomic Number | number of protons in the atomic nucleus of an atom which identifies the element |
| Electron | carries a negative charge |
| Electron Shell | group of orbitals of electrons with similar energies |
| Element | a substance that can not be changed to a simpler substance by a normal chemical reaction |
| Isotope | an alternate form of an element |
| Neutron | carries no charges |
| Proton | carries a postivie charge |
