His discoveries helped lay the groundwork for modern physics and continue to influence scientific research today. Sir William Crookes made significant contributions to atomic theory through his work with thallium and cathode rays. Thomson used a cathode ray tube similar to Crookes’ to discover the electron.His work with cathode rays provided evidence for the existence of electrons.Crookes discovered thallium while experimenting with selenium.This discovery revolutionized atomic theory and provided the foundation for modern physics. He concluded that cathode rays were made up of negatively charged particles, which he called electrons. Thomson used a cathode ray tube similar to Crookes’ and observed that the beam was deflected by both electric and magnetic fields. The Discovery of the ElectronĬrookes’ work with cathode rays was instrumental in the discovery of the electron by J.J. He also discovered that the rays could be used to cause fluorescence in certain materials. This stream became known as cathode rays.Ĭrookes found that these rays could be deflected by magnetic fields and that they had a negative charge. When he applied a high voltage between the electrodes, he observed that a glowing stream traveled from one end of the tube to another. In 1879, he constructed a vacuum tube with electrodes at either end and added an additional electrode perpendicular to them. Learn more about his life, discoveries, and legacy in this biography. He also studied psychic phenomena and founded a journal. One of Crookes’ most important contributions to atomic theory was his work with cathode rays. William Crookes was an English scientist who discovered thallium and designed various types of glass tubes to study cathode rays. It provided evidence for the existence of elements that were previously unknown and showed that elements could be discovered through their spectral lines. Thallium’s discovery had significant implications for atomic theory. He named it after the Greek word “thallos,” meaning “a green shoot or twig.” This line did not correspond to any known element at the time.Ĭrookes investigated further and eventually isolated thallium from a sample of sulfuric acid that had been treated with selenium. He observed a bright green line in the spectrum produced by a sample of selenium that had been exposed to sunlight. William Crookes long life was one of unbroken scientific and business activity, culminating in his appointment as President of the Royal Society in 1913. In 1861, Crookes discovered the element thallium while conducting experiments on selenium. It was during this time that he developed his skills in precision engineering and gained a deeper understanding of scientific principles. At the age of 16, he began working as an apprentice for a local firm that manufactured optical instruments. The Early YearsĬrookes showed an early interest in science and technology. Despite his humble beginnings, Crookes went on to become one of the most influential scientists of his time. Born in London on June 17, 1832, he was the eldest son of a successful tailor. Our product offerings include millions of PowerPoint templates, diagrams, animated 3D characters and more.Sir William Crookes was a renowned British physicist and chemist who made significant contributions to the field of atomic theory. is brought to you by CrystalGraphics, the award-winning developer and market-leading publisher of rich-media enhancement products for presentations. Then you can share it with your target audience as well as ’s millions of monthly visitors. We’ll convert it to an HTML5 slideshow that includes all the media types you’ve already added: audio, video, music, pictures, animations and transition effects. You might even have a presentation you’d like to share with others. And, best of all, it is completely free and easy to use. Whatever your area of interest, here you’ll be able to find and view presentations you’ll love and possibly download. It has millions of presentations already uploaded and available with 1,000s more being uploaded by its users every day. is a leading presentation sharing website.
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