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Nuclear Chemistry Mr. Skirbst Physical Science Topic 21

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Nuclear Chemistry Radioactivity -

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Nuclear Chemistry Radioactivity – - a release of matter and energy that changes the nucleus of an atom

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3 Types of Radiation 1. Alpha particles

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3 Types of Radiation 1. Alpha particles (+) 2 protons & 2 neutrons - can burn skin, but is stopped by paper

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3 Types of Radiation 2. Beta particles

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3 Types of Radiation 2. Beta particles (-) 1 electron & (+) 1 proton (from neutron decay) - can penetrate 3 mm of Al

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3 Types of Radiation 3. Gamma Rays

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3 Types of Radiation 3. Gamma Rays an electromagnetic wave (no charge) - penetrates several centimeters of Pb (lead)

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3 Types of Radiation TypeAt. MassCharge 4+ 0-0

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Nuclear Stability Describes the “strength” of the nucleus

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Nuclear Stability Binding Energy - nuclear force that holds the nucleus together

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Nuclear Stability Radioactive Decay - unstable nucleus breaks down & releases energy & matter

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Nuclear Stability 2 Types of Decay: Alpha decay -releases (2P & 2N) Beta decay - releases (1E & 1P from 1N)

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Nuclear Stability Decay typeat. Massat. # -4-2 same+1

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Nuclear Stability Half Life: - time it takes for ½ the atoms to decay

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Nuclear Stability Nuclear Notation:

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Nuclear Stability Decay Series: - Illustrates radioactive decay

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Nuclear Energy Fission – splitting of atomic nucleus

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Nuclear Energy Fusion – combining of atomic nucleus

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