Download Electric Force - Parkland College

Atoms and Nuclei
Nucleus radius: 1x10-15
Atom radius: 1x10-10
• If the nucleus was the same size as the sun,
how far would the electrons be from it?
Spectra (Hydrogen)
1/λ = R(1/N2 – 1/n2)
R = 1.097x107 m-1
• What are the min. and maximum values for the
wavelengths emitted when hydrogen falls to the
N=2 state (Balmer Series)
Bohr Model
• rn = (5.29x10-11) n2/Z (m)
• En = (-2.18x10-18) Z2/n2 (J)
• En = (-13.6) Z2/n2 (eV)
Z = Atomic #
n = orbital #
Bohr Model
F = kq1q/r2 and ac = v2/r.
Since F = ma, we have kQq/r2 = mv2/r.
Thus mv2 = kQq/r.
This means that 2KE = -EPE
Quantum Physics
Nuclear Structure
A=Z+N
• A = nucleon # or atomic mass number
• Z = number of protons
• N = number of neutrons
• r = (1.2 x 10-15)* A1/3 m
• The density of nuclei are approx. the same.
Nuclear Fission/Fusion
E = mc2
Radioactivity
U
Th + H
Th
Pa + e
P
P
+ γ