the last poster seems to have made a mistake when writing the list...o.o microwave and RADIO** (sorry, i had uv here lol, obviously uv is nowhere near microwave) should be switched in that list, microwaves are technically radio waves, but they are the highest-energy radio waves, and usually they're broken out! anyway, they certainly shouldn't be written as being lower than radio!
anyway, the basic list is as follows (tho you can break up each component of the spectrum into as many sub-spectra as you like):
Gamma-ray
X-ray
Ultraviolet
Visible Light
Infrared
Microwave
Radio
note that the top two are almost always listed like that, but actually physically, the difference is in the source of the photon. x-rays are emitted by electrons, while gamma rays come directly from the nucleus. of course, since the nucleons are a lot more massive than electrons, gamma rays are usually more energetic than x-rays, but some very relativistic electrons in some of the upper orbitals can produce x-rays that can be higher in energy than gamma-rays, so there can be exceptions!
hope this helps!!! :)