Radon Chemistry: Foundations and Applications ... radium gave off a similar emanation (radon), as did actinium (actinon), in 1900 and 1904, respectively. Once the structure of the ... better understood, it was determined that thoron, radon, and actinon were different isotopes of the same element (radon)— ... Read more

radon The Columbia Encyclopedia, Sixth Edition ... series of thorium -232. Radon-219 (half-life 4 sec), also called actinon, is produced in the decay series of uranium -235 (actinouranium ... it radium emanation. In about 1902, F. O. Giesel discovered actinon. In 1908 William Ramsay and R. W. Whytlaw-Gray isolated the ... Read more

See all related entries >