Danielle Bray

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John Dalton

• Danielle Bray

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Where Did He Live?

• John Dalton was born in Eaglesfield, England, on
  September 6, 1766 into a Quaker family.
• He died in Manchester in 1844 of paralysis

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All In the Family

• Dalton Family Tree
• His father, Joseph Dalton, was a weaver in poor
  circumstances, who, with his wife (Deborah
  Greenup), belonged to the Society of Friends
  they had three children -- Jonathan, John and
  Mary.
• A Passage written by his Bother
• My Brother Dalton

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Profession

• Teacher
• English chemist and physicist

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Studies and Discoveries

• Dalton was the first to provide a scientific
  description of color blindness (1794), a
  condition from which he suffered and which was
  long called "Daltonism."
• He researched gases.
• Dalton recorded over 200,000 observations of the
  atmosphere in his notebooks, And discovered the
  law of partial pressures. Dalton's law says that
  pressure of nonreactive gaseous mixture is equal
  to a sum of pressures of each, separate element
  of the mixture having the same volume as the
  mixture has.
• Another Dalton's discovery, which he made in
  1804, was showing that, if two elements have more
  than one combination, then weight amounts of one
  of them belonging to unchanging amount of the
  second one are staying in relations of small
  integers (the law of stoichiometry).
• This work led him to his most important
  theoretical contribution to chemistry, a
  scientifically grounded atomic theory of matter.

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Dalton's Atomic Theory

•  1) All matter is made of atoms. Atoms are
  indivisible and indestructible.
• 2) All atoms of a given element are identical in
  mass and properties
• 3) Compounds are formed by a combination of two
  or more different kinds of atoms.
• 4) A chemical reaction is a rearrangement of
  atoms.

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What is an atom?

• An atom is the smallest piece in an element and
  looks somewhat like this
• The blue area of the atom represents the
  nucleus which is made up of protons (positively
  charged) and neutrons (neutral). Meanwhile the
  green circles are the electrons (negatively
  charged) that orbit around the nucleus in shells
  or orbitals.

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Subatomic Particles
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Modern Theory

• Not all points were correct
• Subatomic Particles
• Proton and Neutron
• Bohr and Beyond

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