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Sir William Crookes and the Fundamentals of Luminescence

Sir William Crookes and the Fundamentals of Luminescence

Harald Sack
On June 17, 1832, British physicist, chemist, science journalist, and parapsychologist Sir William Crookes was born. Crookes visualized cathode rays, discovered the fundamentals of luminescence and isotopes, and developed methods for detecting ionizing radiation. He discovered the chemical element thallium and the thorium isotope 234Th. William Crookes – Biographical Background William Crookes was born in London, the eldest son of the second wife of Joseph Crookes, a very wealthy tailor. He attended…
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chemistry
Theodore William Richards and the Weight of Chemical Elements

Theodore William Richards and the Weight of Chemical Elements

Harald Sack
On January 31, 1868, American chemist Theodore William Richards was born. Richards was the first American scientist to receive the Nobel Prize in Chemistry “in recognition of his accurate determinations of the atomic weight of a large number of chemical elements.” His work meticulously refined the classical gravimetric methods of analysis to better reduce the sources of error. Together with his co-workers, he was able to measure accurate values for atomic weight…
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chemistry
Henry Moseley and the Atomic Numbers

Henry Moseley and the Atomic Numbers

Harald Sack
On August 10, 1915, English physicist, Henry Moseley was killed in action. Moseley‘s contribution to the science of physics was the justification from physical laws of the previous empirical and chemical concept of the atomic number. This stemmed from his development of Moseley’s law in X-ray spectra. “We have now got what seems to be definite proof that an X ray which spreads out in a spherical form from a source as a wave…
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