4/17/2024 0 Comments Crookes atomic theory![]() ![]() These were due to the pressure effect of the light on the evacuated suspended leaves in the balance box and the pressure change due to temperature influence according to the kinetic theory of gases. In his weighings he found very small anomalies. He determined the weight of the element and found an atomic weight of 204.04 u. It is named after the Greek word thallos (“green shoot”) because of the green light effect in spectral analysis. Now Crookes was able to detect the chemical element thallium in his earlier selenium separations during spectroscopic experiments – at the same time as Claude Auguste Lamy. In 1859, Robert Bunsen and Gustav Robert Kirchhoff developed spectral analysis. Oelen, CC BY-SA 3.0, via Wikimedia Commons Spectral Analysis to Discover New Elements Pieces of very pure thallium in glass ampoule under argon. He also belonged to the Theosophical Society and called himself a parapsychologist. In the last years of his life it could be seen that Crookes, like some of his scientific colleagues, was fond of spiritualism. During his life, William Crookes received many honors and awards, becoming a member of the Royal Society in 1863 and knighted in London in 1897. He investigated substances such as uranium and dealt with substances that enabled him to detect radioactivity. Another field of activity in which Crookes was active around 1900 was radioactivity. ![]() Subsequently, he dealt with luminous phenomena in electron tubes and researched rare earths, which he tried to separate chemically. In 1859 he founded the Chemical News, of which he was editor for many years. In addition to his work as a scientist, William Crookes also worked as a journalist. In 1856 he married Ellen Humphrey and in 1857 he became secretary of the Photographic Society in London. In 1854, Crookes obtained a position as meteorologist at the Ratcliffe Observatory in Oxford and, in the same year, an apprenticeship as a chemist in Chester. A year earlier, after experiments with selenium cyanide, he had already found a curious residue that was only later characterized as the new chemical element thallium. ![]() At the age of nineteen, Crookes became an assistant to Hofmann at the school. He attended high school until the age of 16, when he transferred to the Royal College of Chemistry, where August Wilhelm von Hofmann taught. William Crookes was born in London, the eldest son of the second wife of Joseph Crookes, a very wealthy tailor. William Crookes – Biographical Background He discovered the chemical element thallium and the thorium isotope 234Th. Crookes visualized cathode rays, discovered the fundamentals of luminescence and isotopes, and developed methods for detecting ionizing radiation. On June 17, 1832, British physicist, chemist, science journalist, and parapsychologist Sir William Crookes was born. Sir William Crookes (17 June 1832 – 4 April 1919) ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |