Energy

1. the height of a wave from the origin to a crest, or from the origin to a trough
3. a particle of electromagnetic radiation with no mass that carries a quantum of energy
6. a set of frequencies of electromagnetic waves given off by atoms of an element; consists of a series of fine lines of individual colors
12. the energy level contained within a principal energy level
13. a state of a physical system (such as an atomic nucleus, an atom, or a molecule) that is higher in energy than the ground state
14. the capacity to do work or produce heat; exists as potential energy, which is stored in an object due to its composition or position, and kinetic energy, which is the energy of motion
15. the minimum amount of energy that can be gained or lost by an atom

2. includes all forms of electromagnetic radiation; the types of radiation differ in their frequencies and wavelengths
4. a phenomenon in which photoelectrons are emitted from a metal's surface when light of a certain frequency shines on the surface
5. the lowest allowable energy state of an atom
7. a three-dimensional region around the nucleus of an atom that describes an electron's probable location
8. the number of waves that pass a given point per second
9. the shortest distance between equivalent points on a continuous wave; is usually expressed in meter, centimeters, or nanometers
10. a disturbance or variation that transfers energy progressively from point to point in a medium and that may take the form of an elastic deformation or of a variation of pressure, electric/magnetic intensity, electric potential, or temperature
11. electromagnetic radiation of any wavelength that travels in a vacuum with a speed of 3.00 x 10^8 m/s