John Dalton

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John Dalton

John Dalton

By: Sydney Gamer P.1

Born:September 6, 17661803:Dalton noted that oxygen and carbon combined to make two compounds (Dalton's Law of Partial Pressures).1803:Dalton created the first chart of atomic weights.1808:published "A New System of Chemical Philosophy"1810:Dalton published an appendix to "A New System of Chemical Philosophy"Died: July 27, 1844

Dalton lived in the late 1700's to the mid 1800's. In his early career, he identified the hereditary nature of red-green color blindness. He could relate to his experminets since both him and his brother suffered from color blindness. Dalton experimented on a small piece of his own eye tissue to make important findings. In 1803 he revealed the concept of Dalton’s Law of Partial Pressures. In the 1800s, he was the first scientist to explain the behavior of atoms in terms of weight.

What did John Dalton do?

Dalton's Atomic Theory1) All matter is made of atoms. Atoms are indivisible and indestructible.2) All atoms of a given element are identical in mass and properties3) Compounds are formed by a combination of two or more different kinds of atoms.4) A chemical reaction is a rearrangement of atoms.

1832- honorary Doctorate of Science degree from the prestigious Oxford University 1834-Doctorate of Laws, by Edinburgh University in London, 1834- a statue was erected in Dalton's honor

Dalton took the ideas of Democritus. His atomic theory was Matter could not be divided into smaller and smaller pieces forever, eventually the smallest possible piece would be obtained. This piece would be indivisible. He named the smallest piece of matter “atomos,” meaning “not to be cut.” Dalton then expanded on Democritus's ideas and made his own conclusions.

Important Dates






Modern Atomic TheoryToday we know that atoms can be destroyed via nuclear reactions but not by chemical reactions. Also, there are different kinds of atoms (differing by their masses) within an element that are known as "isotopes", but isotopes of an element have the same chemical properties.


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