Lab 8 Pre Lab Notes

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Lab 8 Pre Lab Notes

• Atomic Theory and the Atom

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Main Points of Daltons Atomic Theory(Developed
in the late 1700s)

• All elements are composed of atoms
• All atoms of the same element have the same mass,
  and atoms of different elements have different
  masses

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Daltons Atomic Theory(cont)

• Compounds contain atoms of more than one element
• In a particular compound, atoms of different
  elements always combine in the same way

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Atoms are composed of 3 parts

• 1.  Protons
• -positive charge
• -mass of 1 amu
• -centrally located

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Atoms are composed of 3 parts

• 2.   Neutrons
• - no charge
• - mass of 1 amu
• - centrally located

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Atoms are composed of 3 parts

• 3.  Electrons
• - negative charge
• - no relative mass
• - peripherally located

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Bohrs Model of the Atom
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Elemental Math

• Atomic Number Same as the number of protons
• Mass Number number of protons number of
  neutrons

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Elemental Math

• Ion Number number of protons number of
  electrons
• Ion A charged Particle

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Elemental Math

• Isotope an isotope contains a different number
  of neutrons than an element.

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Atomic Symbol
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