photon

https://doi.org/10.1351/goldbook.P04627
Particle of zero charge, zero rest mass, spin quantum number 1, energy \(h\ \nu \) and @M04007@ \(\frac{h\ \nu }{c}\)(\(h\) is the @P04685@, \(\nu \) the frequency of radiation and \(c\) the speed of light), @C00859@ of electromagnetic force.
Sources:
Green Book, 2nd ed., p. 93 [Terms] [Book]
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2262 [Terms] [Paper]