Bohr Diagrams

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Bohr Diagrams

• Electron Energy States

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Bohr Model

• Bohr - electrons in an atom can have only
  specific amounts of energy NEW idea!
• quantum number (n) assigned to each orbit
• the smallest orbit (n 1)
• is closest to the nucleus
• has the lowest energy
• the larger the orbit, the more energy it has
• n 7 has highest energy

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Bohr Diagram

• Shows all the electrons in orbits or shells about
  the nucleus.

n2
n3
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Electron Transitions

• Energy is absorbed
• electron gains energy, becomes excited and moves
  to higher orbit (farther from nucleus)
• Endothermic process
• Energy is released
• electron loses energy and drops to lower orbit
• (closer to nucleus)
• Exothermic process
• LIGHT is emitted

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energy levels get closer together as move away
from nucleus
Larger orbits hold more electrons
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Max Capacity of Bohr Orbits
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Ground State vs. Excited State

• Ground state
• lowest energy state of atom
• electrons are in lowest possible energy levels
• Configurations in Reference Tables are ground
  state
• Excited state
• many possible excited states for each atom
• one or more electrons excited to higher energy
  level

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• 2-8-5 ground state
• excited state possibilities
• 2-8-4-1
• 2-8-3-2
• 2-8-3-1-1
• etc