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Infra-red
William Herschel, a British astronomer, discovered infra-red radiation (heat waves) -
UV radiation
German chemist Johann Ritter discovered UV radiation -
EM waves
James Maxwell, a British scientist, predicted the existence of continuous EM waves. -
Radio Waves
German scientist Heinrich Hertz discovered radio waves. -
X-rays
German physicist Wihelm Roentgen discovered x-rays. -
Uranium
French physicist Henri Becquerel discovered radioactive rays emitted by uranium. -
Radium
Marie Curie discovered radium. -
Gamma Rays
Frenchman Paul Villard discovered gamma rays.