| A | B |
|---|
| Electromagnetic radiation | visible light is a kind of this, exhibits wavelike behavior as it travels through space |
| Electromagnetic spectrum | all forms of electromagnetic radiation together |
| Wavelength | distance between corresponding point on adjacent waves |
| Frequency | number of waves that pass a specific point in a given amount of time |
| Photon | particle of light that carries energy |
| Ground state | lowest energy state of an atom |
| Excited state | atom having higher potential energy than at ground state |
| Electron configuration | arrangement of electrons in an atom |
| Aufbau principle | electron occupies the lowest-energy orbital that can receive it |
