ATOMIC THEORIES

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ATOMIC THEORIES

• Democritus
• Dalton
• Modern

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1st Atomic Theory
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1st Atomic Theory

• Democritus
• (Greek 400 B.C.)

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1st Atomic Theory

• Democritus
• (Greek 400 B.C.)
• Matter is made of tiny particles, atoms.

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1st Atomic Theory

• Democritus
• (400 b.c.)
• Matter is made of tiny particles, atoms.
• Different types of atoms exist for every type of
  matter.

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1st Atomic Theory based on Science
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1st Atomic Theory based on Science

• John Dalton (English 1803)

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1st Atomic Theory based on Science

• John Dalton (English 1803)
• All matter is made of indivisible atoms.

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1st Atomic Theory based on Science

• John Dalton (English 1803)
• All matter is made of indivisible atoms.
• All atoms of an element are alike.

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1st Atomic Theory based on Science

• John Dalton (English 1803)
• All matter is made of indivisible atoms.
• All atoms of an element are alike.
• Atoms of different elements are different.

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1st Atomic Theory based on Science

• John Dalton (English 1803)
• All mater is made of indivisible atoms.
• All atoms of an element are alike.
• Atoms of different elements are different.
• Compounds form when atoms bond.

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1st Atomic Theory based on Science

• John Dalton (English 1803)
• All mater is made of indivisible atoms.
• All atoms of an element are alike.
• Atoms of different elements are different.
• Compounds form when atoms bond.
• In a given compound, the number and kind of atoms
  is constant.

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Modern Atomic Theory
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Modern Atomic Theory

• Atoms ARE divisible they are made of subatomic
  particles

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Modern Atomic Theory

• Atoms ARE divisible they are made of subatomic
  particles
• protons and neutrons in a nucleus surrounded by

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Modern Atomic Theory

• Atoms ARE divisible they are made of subatomic
  particles
• protons and neutrons in a nucleus surrounded by
• electrons in an electron cloud

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Modern Atomic Theory

• Atoms ARE divisible they are made of subatomic
  particles
• protons and neutrons in a nucleus surrounded by
• electrons in an electron cloud
• Number of neutrons can vary, creating isotopes.

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Modern Atomic Theory

• Contributors to the modern atomic theory
• Democritus - first atomic theory

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Modern Atomic Theory

• Contributors to the modern atomic theory
• Democritus
• Lavosier

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Modern Atomic Theory

• Contributors to the modern atomic theory
• Democritus
• Lavosier - Law of conservation of mass
• (The mass of a product is always the same as the
  mass of the reactants. Matter isnt created or
  destroyed.)

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Modern Atomic Theory

• Contributors to the modern atomic theory
• Democritus
• Lavosier
• Proust

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Modern Atomic Theory

• Contributors to the modern atomic theory
• Democritus
• Lavosier
• Proust - Law of definite proportions
• (A given substance always has the same elements
  in the same proportions.)

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Modern Atomic Theory

• Contributors to the modern atomic theory
• Democritus
• Lavosier
• Proust
• Dalton- Law of multiple proportions
• (If two elements contain the same elements, the
  elements always combine in small whole number
  ratios.)

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Modern Atomic Theory

• Contributors to the modern atomic theory
• Democritus
• Lavosier
• Proust
• Dalton- Law of multiple proportions
• - 2nd Atomic Theory

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Modern Atomic Theory

• Contributors to the modern atomic theory
• Democritus
• Lavosier
• Proust
• Dalton
• Thomson - protons and electrons

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Modern Atomic Theory

• Contributors to the modern atomic theory
• Democritus
• Lavosier
• Proust
• Dalton
• Thomson
• Rutherford - nucleus

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Modern Atomic Theory

• Contributors to the modern atomic theory
• Democritus
• Lavosier
• Proust
• Dalton
• Thomson
• Rutherford
• Chadwick - neutrons

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Modern Atomic Theory

• Contributors to the modern atomic theory
• Democritus
• Lavosier
• Proust
• Dalton
• Thomson
• Rutherford
• Chadwick