| As a result of the nucleon transformations, a new proton is left behind in the nucleus and the atomic number of the atom is raised by one. |
| The transfermium elements are those elements with atomic numbers greater than 100, the atomic number for fermium. |
| The existence of an element with an atomic number of 21 was predicted in 1869 by Dmitri Mendeleev. |
| Atoms of an element that have the same atomic number but a different atomic weight are referred to as isotopes. |
| In such a case, an element's atomic number and atomic mass should be about equal. |
| When assigning priority to groups, atoms that are directly bonded to the carbon atom have their priority based upon their atomic number. |
