The Aurora Borealis, or Northern Lights, shines above Bear Lake, Eielson Air Force Base, Alaska

http://www.af.mil/weekinphotos/wipgallery (Full Image)

 United States Air Force photo by Senior Airman Joshua Strang

 

 

Bohr's Conclusions

 

Think of an atom as a
 miniature solar system

 

3 orbits are permitted
for this atom



1. Permitted orbits of an electron in an atom are limited

 

 

2. Each orbit is a different energy

 

 

3. Inside orbits have lower energies than the outside ones

 

 

4. When electrons in an atom change energy states they absorb or release energy

 

 

 


Up energy level,

energy absorbed










Down energy level, 

energy  released
 
as light

 

 

 

 

Permitted Orbital Energies
for Hydrogen

 

 

Reference table

 

 

 

 

 

 

Each orbital is associated with a specific energy

 

Energy
Level #

Energy

 

n = 3

-1.51 eV

 

Excited State

 

n = 2

-3.40 eV

 

Excited State

 

n = 1

-13.6 eV

Ground State Lowest Energy Level

 

 

 

Electrons can only absorb or emit energy that is equal to the difference between the absolute value of 2 energy levels.

 

 

 

 

 

A single photon of energy is given off when electrons go down energy levels.

 

 

 

 


 

 

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