Bohr Model

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Bohr Model
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Bohr Model

• Neils Bohr developed the theory that electrons
  orbit the nucleus of an atom in various energy
  levels (orbitals or shells). The number of
  orbitals is determined by the number of electrons
  in the atom.

Tellurium
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Are There Different Kinds of Electrons?

• The answer is no. The only way electrons can
  differ from one another is in their energy
  levels.
• They all have the same mass and the same charge

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Electron Energy Levels

• Electrons exist around the nucleus in different
  energy levels.
• Only a certain number of electrons can occupy a
  single energy level
• K (1) 2 - N (4) 32
• L (2) 8 - O (5) 50
• M (3) 18 - P (6) 72
• Formula 2n2

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Electron Energy Levels

• As you move across the period table with
  increasing atomic number, the energy levels
  generally fill up before the next one starts (up
  to the atomic number 18 Argon)

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Electron Energy Levels

• As you move down the periodic table the number of
  energy levels increases by one for each period

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Shell structure

• CarbonC
• SodiumNa
• NeonNe
• ChlorineCl
• How many protons and electrons do these elements
  have?
• Draw the electron shell structure for each.

Review what is this element?