(History of the Atomic Theory) - by Brason Jones
Photo of Henry Moseley (November 23, 1887-August 10, 1915)
Henry Moseley was born on November 23, 1887 in Weymouth, England.
Moseley received his education at numerous private schools and, when in elementary school, won a scholarship to a renowned high school, Eton College. Here, he found physics to be overly simple and began to study the subject unaccompanied.
Trinity College at University of Oxford
Moseley attended University of Oxford and hoped to garner a first class honors degree in physics; however, due to having hayfever during final exams and not doing well on the tests, he received a second class honors degree.
By taking the X-ray frequencies found in the experiment, finding their square root, and plotting this on a graph next to the corresponding element's atomic number, Moseley found it made a straight line. Simply put, this meant that an element's atomic number matched the charge, or amount of protons, it had; thus, when Moseley put elements in the order of their number of protons rather than their atomic masses, the incorrect order of elements that had previously been seen was nonexistent. This declared the hypothesis by Antonius van den Broek to be correct.
Article Regarding Moseley's Death
Physicist Henry Moseley had a strong impact on the atomic theory as he assisted in perfecting the periodic table. Without his experiments which involved using X-ray frequencies and electrons to determine the number of protons in an atom, the periodic table might have never been made correct. Moseley assisted in our understanding of atomic structure, element identification, the order of the periodic table and, ultimately, the atomic theory.
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