| A | B |
|---|
| electron configuration | most stable arrangement of electrons in sublevels and orbitals |
| Heisenberg uncertainty principle | principle that it is impossible to accurately measusre both the position and the energy of an electron at the same time |
| inner transition element | one of the elements in the two rows of elements below the main body of the periodic table.; lanthanides and actinides |
| orbital | space in which there is a high probability of finding an electron |
| sublevel | small energy divisions in a given energy level. |
| emission spectrum | process revealing what cannot be seen directly concerning an atom |
| alkali metal | any element from group I |
| alkaline earth metal | any element from group II |
| halogen | any element from group 17 |
