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Infra-Red
William Herschel, a British astronomer, discovered infra-red radiation -
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 disovered radio waves -
X-rays
German physicist Wilhelm Roentgen discovered x-rays -
Radioactive rays
French physicist Henri Becquerel discovered radioactive rays emitted by uranium -
Radium
Marie Curie discovered radium -
Gamma rays
Frenchman Paul Villard discovered gamma rays