Atoms and Isotopes

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Atoms and Isotopes
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How do atoms differ?

• The number of protons!!!!!!

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• The atomic number is the number of protons in an
  atom
• On the periodic table, elements are arranged in
  increasing atomic number

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3 Li
atomic number
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• Remember Atoms are
• electrically NEUTRAL
• because they have the
• SAME amount of protons and
• electrons!!!!

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atomic number

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Are you having fun yet?
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• The atomic number is the number of protons in an
  atom
• The atomic number IDENTIFIES the atom

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Mass Number

• The mass number is the
• number of protons
• PLUS the number of
• neutrons

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• The mass of the atom is
• mainly inside the nucleus!
• (where the p and n0 are)

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Isotopes

• Isotopes are atoms of the same element with the
  same number of protons, but DIFFERENT NUMBERS OF
  NEUTRONS

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Isotopic Notation
mass number
symbol
atomic number
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example
mass number
Ne
atomic number
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Isotopic Name
element name mass number
Neon 22
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