In 1861 he discovered thallium in some seleniferous deposits.

For background information see Alexander Findlay, A Hundred Years of Chemistry (1937; 3d ed. Tubes such as this are still called "Crookes tubes," and his work was honored by naming the space near the cathode in low pressure "Crookes dark space.". Nevertheless, Crookes's experimental work in this field was the foundation of discoveries which eventually changed the whole of chemistry and physics. His first important discovery was that of the element thallium, announced in 1861, and made with the help of spectroscopy. During his studies of thallium, Crookes discovered the principle of the Crookes radiometer, a device that converts light radiation into rotary motion. Explore City Wise Colleges, Institutions, Universities, Consultancies, Associations and Suppliers in edubilla.com, Click Here to Know about a Legend Dr.A.P.J. 1969). His education was limited, and despite his father's wish that he become an architect, he chose industrial chemistry as a career. He died in London on April 4, 1919. His interests, ranging over pure and applied science, economic and practical problems, and psychiatrical research, made him a well-known personality, and he received many public and academic honors. He developed the Crookes tubes,investigating cathode rays. Sir William Crookes, (born June 17, 1832, London, Eng.—died April 4, 1919, London), British chemist and physicist noted for his discovery of the element thallium and for his cathode-ray studies, fundamental in the development of atomic physics. Patents by Inventor William Crookes William Crookes has filed for patents to protect the following inventions. Terms of Use While determining the atomic weight of thallium, using a delicate vacuum balance, he noticed several irregularities in weighing, which he attributed to the method. His education was limited, and despite his father's wish that he become an architect, he chose industrial chemistry as a career. It remained for Sir J. J. Thomson to expound on the subatomic nature of cathode rays (consisting of streams of negative electrons). In 1861, Crookes discovered a previously unknown element with a bright green emission line in its spectrum and named the element thallium, from the Greek thallos, a green shoot. As the luminescence did not depend on what gas had been in the vacuum or what metal…. At about the same time as this important discovery, he observed that when "p-particles", ejected from radio-active substances, impinge upon zinc sulfide, each impact is accompanied by a minute scintillation, an observation which forms the basis of one of the most useful methods in the technique of radioactivity. The English chemist and physicist Sir William Crookes (1832-1919) discovered the element thallium and invented the radiometer, the spinthariscope, and the Crookes tube.

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