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Atomic Structure
Notes
Thomson Model
The “pudding” had a
positive charge and the
“plums” had a negative
charge.
Rutherford Model – Gold Foil
Experiment
Discovered a Nucleus and
that the electrons were
away from the nucleus.
Bohr Model
Bohr included
only
protons
and
electrons in
his original
model.
Chadwick – Bohr’s
student discovered
neutrons.
Wave Model
Subatomic Particles Location
• Proton (p+) – Positive Charge – Nucleus
• Neutron (n°) – Neutral Charge - Nucleus
• Electron (e-) – Negative Charge – Energy
Levels
•
Electron
Cloud
Atomic Structure
Atomic Structure
• Atomic Number = #p+ and
• Atomic Mass =
#p+
+
#e#n°
Protons and neutrons make up the mass of the atom
• #n° =
atomic mass – atomic number
Valence Electrons
• Valence electrons are the electrons in the
outermost energy level.
Modern Bohr Model
Energy Levels
1st – 2e2nd – 8e3rd – 18e4th – 32e5th – 32e6th – 18e7th – 8e-
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