4.2 – Subatomic Particles and the Nuclear Atom • OBJECTIVES : Students will be able to (SWBAT) 1. Distinguish between the subatomic particles in terms of relative charge and mass 2. Describe the structure of the nuclear atom • 8 lecture/10 reading questions • 5 -sentence summary
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4.2 – Subatomic Particles and the Nuclear Atom
• OBJECTIVES: Students will be able to (SWBAT)
1. Distinguish between the subatomic particles in terms of
relative charge and mass
2. Describe the structure of the nuclear atom2. Describe the structure of the nuclear atom
• 8 lecture/10 reading questions
• 5-sentence summary
Notes: Subatomic Particles and
the Nuclear Atom (4.2)
Parts of the Atom – The Subatomic
ParticlesPart 1: The Electron
Part 2: The Nucleus &
the Proton
Part 3: The Neutron
electron nucleus
proton neutron
Part 3: The Neutron
Opposite charges attract; same or like
charges repel
OPPOSITE CHARGES
LIKE CHARGES
Part 1: THE ELECTRON
JJ Thompson and the Discovery of the
Electron (1897)
• Discovered the electron and the charge to
mass ratio of the electron.
• His experiment:
– Thin beam of electrons (negatively charged) goes – Thin beam of electrons (negatively charged) goes
through a glass tube (cathode ray tube, CRT)
– The beam bends toward a positively charged plate
and away from a negatively charged plate �
beam of electrons must be negatively charged.
Cathode - Charged Plate
Zinc Sulfide Screen
Anode Spinner + Charged
- Charged Plate
+ Charged Plate
Cathode Rays
Thompson's Cathode Ray Tube (CRT)Thompson's Cathode Ray Tube (CRT)