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19

Jul

July 19, 1838 - Death of Pierre Louis Dulong who found the relationship between the specific heat of an element and its atomic weight

20

Jul

July 20, 1937 - Death of Guillaume Marconi, father of radiotelegraphy

20

Jul

July 20, 2007 - Death of Kai Siegbahn, Nobel Prize for his contributions to the development of high-resolution laser spectroscopy

20

Jul

July 20, 1911 - Antonius van den Broek publishes the direct correlation between the charge of the atomic nucleus and the periodic table

21

Jul

July 21, 1620 – Birth of Jean Picard, the first to give an exact measurement of the radius of the Earth

22

Jul

July 22, 1887 – Birth of Gustav Hertz, Nobel Prize winner for his research on the passage of electrons through a gas

23

Jul

Jul 23, 1916 - Death of William Ramsay, discovers the 6 noble gases of the periodic table

24

Jul

July 24, 1974 - Death of James Chadwick, discoverer of the neutron

25

Jul

July 25, 2008 – Death of Tracy Hall, the first person to manufacture synthetic diamonds

25

Jul

July 25, 1920 - Birth of Rosalind Franklin "the woman who X-rayed life"

26

Jul

July 26, 2003 - Death of Hilde Levi, a pioneer in the use of radiocarbon dating techniques and autoradiography

27

Jul

July 27, 1844 – Death of John Dalton, naturalist, chemist, mathematician, meteorologist, and father of modern atomic theory

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