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Slide 1
Unit 3 Electron Configurations Part B: Bohrs Model of Hydrogen
"Every word I utter is to be understood not as an affirmation but
as a question."
Slide 2
What have we learned so far? Discharging Tubes The Flame Test
The light coming out of the excited atomic entities is very
specific to particular element! Results are quite
reproducible.
Slide 3
Conclusions: Electromagnetic radiations (lights) coming out or
being absorbed by atoms indicate that there are very specific
energy changes within the atomic entities (atoms and ions). No
nuclear changes have ever been observed indicate that the energy
changes have to come from electrons surrounding the nucleus.
Slide 4
How come? Classic Model: Problems with the classic model:
Slide 5
Niels Bohr (1885 1962)
Slide 6
Bohrs Model of Hydrogen Atom Increasing energy Nucleus First
Second Third Fourth Fifth } Further away from the nucleus means
more energy. There is no in between energy Energy Levels
Slide 7
Bohrs Model of Hydrogen Atom quantum quantity of energy gained
or lost by an atom when electrons are excited photon a quantum of
light ground state lowest energy level of an atom excited state a
heightened state of energy in an atom Electrons of hydrogen circle
the nucleus in orbits 1. orbits have a fixed amount of energy in
the ground state. 2. orbits are a fixed distance from the nucleus.
3. orbits furthest from the nucleus have the greatest energy.