Historical Development Of Atomic Structure



T3 IBS Chemistry
Ms. Redman
The idea behind the "atom" goes back to the Ancient Greek society, where
scientists believed that all matter was made of smaller, more fundamental
particles called elements. They called these particles atoms, meaning "not
divisible." Then came the chemists and physicists of the 16th and 17th centuries
who discovered various formulae of various salts and water, hence discovering
the idea of a molecule.

Then, in 1766 was born a man named John Dalton born in England. He is known as
the father of atomic theory because he is the one who made it quantitative,
meaning he discovered many masses of various elements and, in relation,
discovered the different proportions ...

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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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Added: 8/21/2004 09:09:16 PM
Category: Science & Nature
Type: Premium Paper
Words: 1213
Pages: 5

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