Term 2 Week 4 2017

Homework

• Ex 5A, p. 151-155, Models of the Atom
• Ex 5B, p. 160-171, Radioactivity

History of the Atom

Models of the Atom

Thomson's Plum Pudding Model

Rutherford's Gold Foil Experiment

Parts of the Atom

Isotopes

Isotopes are versions of an atom or an element that have the same number of protons, but different numbers of neutrons

What are Isotopes?

Radioactive Decay

Alpha, Beta & Gamma Radiation

• Alpha particles are emitted by a larger nucleus that has too many Protons
• Beta particles are emitted by a nucleus that has too many Neutrons
• Gamma photons are emitted by a nucleus that has too much Energy (is in an exited state)

• PhET Alpha Decay app can be found here
• PhET Beta Decay app can be found here

Alpha Decay

Beta Decay

Radiation

Types of Radiation

Is radiation dangerous?

The Most Radioactive Places on Earth

Millisieverts and Radiation - Sixty Symbols

Half Life

Nuclear Half Life: Intro and Explanation

Nuclear Half Life: Calculations