A look at the atom, close up!

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A look at the atom, close up!
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Development of modern atomic theory
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Daltons Atom

• Daltons Model says that
• All matter is made of individual particles called
  atoms
• Atoms are solid spheres

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Thompsons Atom

• Thompsons Model says that
• Atoms have positive parts called protons and
  negative parts called electrons
• The electrons and protons are
• evenly spread throughout the atom

Electrons
Protons
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Rutherfords Atom -1899
Electrons

• Rutherfords Model says that
• The protons and neutrons are tightly packed in
  the center of an atom

Protons
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Bohrs Atom
Electrons

• Bohrs Model says that
• Electrons are arranged in different rings around
  the nucleus

Protons
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Modern Atomic Theory
Electrons

• Modern atomic theory says that
• We cannot predict where the electron will be next
• Electrons move throughout the shells as clouds
  of electrons

Protons
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Atomic Number
How is the atomic number found? What is the
atomic number of this atom? Do all Carbon
atoms have the same atomic number?
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Atomic Mass
How is atomic mass found? What is the atomic
mass of this atom? Atomic mass Atomic
Weight
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Isotopes
Are these atoms the same element? Are they
isotopes?
Are these atoms the same element? Are they
isotopes?
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Quiz Tomorrow

• Organizational levels
• Modeling atoms (the outside stuff caps)
• Subatomic particles
• Atomic mass
• Atomic number
• Isotopes

FUN!!!
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Organizational Levels
Universe Galaxy Solar System Planet Population Org
anism Organs Tissues Cells Macromolecules Molecule
s Atoms Protons, Neutrons, Electrons