| A | B |
|---|
| Heisenberg uncertainty principle | it is impossible to determine simultaneously both the position and velocity of a subatomic particle |
| quantum theory | mathematical description of the wave properties of electrons and other small particles |
| orbital | 3-D region around the nucleus that indicates where a electron is likely to be |
| quantum numbers | system for specifying the properties of atomic orbitals and the properties of electrons in orbitals |
| principal quantum number | n, indicates the main energy level occupied by the electron |
| angular momentum quantum number | l, indicates the shape of the orbital |
| magnetic quantum number | m, indicates the orientation of an orbital around the nucleus |
| spin quantum number | indictaes the two fundamental directions or states of the electron's magnetic field |
