Models of the Atom - Orbits to Clouds

Bohr:1. Newton’s 2nd Law… electric force

causes electron to move at velocity

v at radius r. k e2/r2 = m v2/r

2. Energy is kinetic and electric.

E = 1/2 m v2 - k e2/r

3. Angular motion is “quantized”.

L = m v r = n h/ 2 p

4. Photon equals energy difference

Ef - Ei = h f

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