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John Dalton’s Atomic
Theory
Ryan Templeton, Sam
Sanavi
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Photos of Dalton
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Who is John Dalton?
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Born September 6, 1766, in Eaglesfield, England
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Died July 26, 1844 in Manchester, England
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Religious man, he was a Quaker, kept him from his fame
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Teacher at the age of twelve, principal 5 years later
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Professor at New College in Manchester
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Studies
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First got into meteorology
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Researched color blindness which he had
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Through his interests in atmospheric pressure he was led to
gases
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Studied gases and came up with his atomic theory
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Dalton’s Atomic Theory
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Dalton revised Democritus’s atomic law through
experimental trial.
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Believed of extremely small particles known as “atoms”.
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Atoms are identical in means of mass, chemistry, size, and
mass.
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Atoms cannot be created, divided, or destroyed.
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Different atoms combine to form compounds.
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In chemical reactions, atoms are separated, combined, or
rearranged.
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Compared to Democritus’ theory.
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Dalton’s atomic theory was a revised version of Democritus’
theory.
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Democritus believed of small objects holding mass together
known as Atoms.
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Dalton and Democritus believed atoms were indivisible and
invincible.
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Dalton thought all atoms were one size, Democritus said all
were different.
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Democritus believed that physical traits of an object were
caused by size and movement of atoms; Dalton did not
believe this.
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Compared to todays theory.
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Dalton’s theory was technically valid, but in comparison to
modern atomic theory, it was a bit off.
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We know that atoms can be destroyed by nuclear reactions
but not chemical reactions.
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We also know that not all atoms are the same. Atoms can
differ by factors such as mass thus making Isotopes.
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Conclusion
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Dalton’s atomic theory was a
necessary and imperative study in
science that showed the true make up
of matter.
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Even though some of his theories are
wrong, it can’t be said that his work
was not needed.
His
theory holds theoretical
foundation in science.
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Websites to look at
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http://www.biography.com/people/john-dalton-9265201
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http://www.iun.edu/~cpanhd/C101webnotes/composition/d
alton.html