english physicist henry moseley redefined the periodic table as being organized by atomic number not atomic weight.
english physicist henry moseley redefined the periodic table as being organized by atomic number not atomic weight.
who redefined the periodic table as being organized by atomic number not atomic weight?
english physicist henry moseley
bullet::::- dmitri mendeleyev, who originated the periodic table of the elements, never received a nobel prize. he completed his first periodic table in 1869. however, a year earlier, another chemist, julius lothar meyer, had reported a somewhat similar table. in 1866, john alexander reina newlands, presented a paper that first proposed a periodic law. however, none of these tables were correct—the 19th century tables arranged the elements in order of increasing atomic weight (or atomic mass). it was left to the english physicist henry moseley to base the periodic table on the atomic number (the number of protons). mendeleyev died in 1907, six years after the first nobel prizes were awarded. he came within one vote of winning in 1906, but died the next year. hargittai claimed that mendeleyev's omission was due to behind-the-scenes machinations of one dissenter on the nobel committee who disagreed with his work.
nobel prize controversies
the idea of the direct correlation of the charge of the atom nucleus and the periodic table was contained in his paper published in "nature" on july 20, 1911, just one month after rutherford published the results of his experiments that showed the existence of a small charged nucleus in an atom (see rutherford model). however, rutherford's original paper noted only that the charge on the nucleus was large, on the order of about half of the atomic weight of the atom, in whole number units of hydrogen mass. rutherford on this basis made the tentative suggestion that atomic nuclei are composed of numbers of helium nuclei, each with a charge corresponding to half of its atomic weight. this would make the nuclear charge nearly equal to atomic number in smaller atoms, with some deviation from this rule for the largest atoms, such as gold. for example, rutherford found the charge on gold to be about 100 units and thought perhaps that it might be exactly 98 (which would be close to half its atomic weight). but gold's place in the periodic table (and thus its atomic number) was known to be 79.
antonius van den broek