![]() In 1904, Thomson proposed the “plum pudding” model of atoms, which described a positively charged mass with an equal amount of negative charge in the form of electrons embedded in it, since all atoms are electrically neutral. However, the positively charged part of an atom was not yet well understood. Millikan: He discovered that the weight of an electron is 1840 times smaller than a hydrogen atom (atomis mass of 1) Thomson: Thomson was the first person to suggest the theory of the atom. Scientists had now established that the atom was not indivisible as Dalton had believed, and due to the work of Thomson, Millikan, and others, the charge and mass of the negative, subatomic particles-the electrons-were known. Since the charge of an electron was now known due to Millikan’s research, and the charge-to-mass ratio was already known due to Thomson’s research (1.759 10 11 C/kg), it only required a simple calculation to determine the mass of the electron as well. The electron had previously been discovered to have a charge-to-mass ratio, according to J. Millikan concluded that this value must therefore be a fundamental charge-the charge of a single electron-with his measured charges due to an excess of one electron (1 times 1.6 10 −19 C), two electrons (2 times 1.6 10 −19 C), three electrons (3 times 1.6 10 −19 C), and so on, on a given oil droplet. Millikan began measuring the charge on an electron with an oil drop as a professor at the University of Chicago in 1908. ![]() Looking at the charge data that Millikan gathered, you may have recognized that the charge of an oil droplet is always a multiple of a specific charge, 1.6 10 −19 C. Dalton thought that atoms were the smallest units of matter tiny, hard spheres that could not be broken down any further. However, one of his underlying assumptions was later shown to be incorrect. Becquerels education led him to work as an engineer in. (U.S.A.), as the second son of the Reverend Silas Franklin Millikan and Mary Jane Andrews. ![]() As the son of a professor of applied physics, he himself became a physicist. (1868-1953) Robert Andrews Millikan was born on the 22nd of March, 1868, in Morrison, Ill. ![]() The tabulated data are examples of a few possible values. Daltons ideas proved foundational to modern atomic theory. Henri Becquerel was born in Paris, France on December 15, 1852. \): Millikan’s experiment measured the charge of individual oil drops. In 1909, more information about the electron was uncovered by American physicist Robert A. ![]()
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