| A | B |
|---|
| angular momentum quantum number | the quantum number that indicates the shape of the orbital |
| Aufbau principle | an electron occupies the lowest-energy orbital that can receive it |
| continuous spectrum | the emission of a continuous range of frequencies of electromagnetic radiation |
| electromagnetic radiation | a form of energy that exhibits wavelike behavior as it travels through space |
| electromagnetic spectrum | all the forms of electromagnetic radiation |
| electron configuration | the arrangement of electrons in an atom |
| excited state | a state in which an atom has a higher potential energy than it has in its ground state |
| frequency | the number of waves that pass a given point in a specific time, usually one second |
| ground state | the lowest energy state of an atom |
| Heisenberg uncertainty principle | it is impossible to determine simultaneously both the position and velocity of an electron or any other particle |
| highest occupied energy level | the electron-containing main energy level with the highest principal quantum number |
| Hund’s rule | orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron, and all electrons in singly occupied orbitals must have the same spin |
| inner-shell electron | an electron that is not in the highest occupied energy level |
| line-emission spectrum | a series of specific wavelengths of emitted light created when the visible portion of light from excited atoms is shined through a prism |
