| A | B |
|---|
| Photon | quantum of light |
| Atomic spectrum | element's "fingerprint" |
| "n" | symbol for principle quantum number |
| Two | maximum number of electrons in an orbital |
| Three | number of p orbitals in a given energy level |
| Five | number of d orbitals in a given energy level |
| Six | maximum number of electrons in a set of p orbitals |
| Photon energy | directly proportional to photon frequency |
| Orbit | circular path followed by an object |
| Orbital | a volume of space within which an electron may reside. |
| s orbital | shaped like a sphere |
| p orbital | shaped like dumbbell |
