| A | B |
| photon | a particle of light defined as a discrete bundle (or quantum) of electromagnetic (or light) energy |
| atomic emission spectrum | pattern of lines formed when light passes through a prism to separate it into the different frequencies of light it contains |
| ground state | lowest allowed energy state of an atom, molecule, or ion |
| quantum number | any of several quantities of integral or half-integral value that identify the state of a physical system such as an atom, a nucleus, or a subatomic particle |
| deBroglie equation | equation used to describe the wave properties of matter, specifically the wave nature of the electron |
| Heisenberg uncertainty principle | states that we cannot know both the position and speed of a particle |
| quantum mechanical model | describes the principal energy level, energy level, orbital (arbitrary level), and spin of |
| atomic orbital | a function describing the location and wave-like behavior of an electron in an atom |
| principal quantum number | a set of positive integers that decide the size and energy of an orbital |
| principal energy level | electron shells |
| energy sublevel | refer to energies associated with electrons |