Historical Development Of Atomic Structure

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the known elements. His name was Mendeleyev, and he was a renowned
teacher. Because no good textbook in chemistry was available at the time, he
wrote the two-volume Principles of Chemistry (1868-1870), which later became a
classic. During the writing of this book, Mendeleyev tried to classify the
elements according to their chemical properties. In 1871 he published an
improved version of the periodic table, in which he left gaps for elements that
were not yet known. His chart and theories gained acceptance by the scientific
world when three elements he "predicted"—gallium, germanium, and scandium—were
subsequently discovered In 1856 another important figure in atomic theory was
born: Sir Joseph John Thomson. In 1906, after teaching at the University of
Cambridge and Trinity University in England, he won the Nobel Prize in physics
for his work on the conduction of electricity through gases. He discovered what
an electron is using cathode rays. An electron is the smallest particle ...

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