# AP Physics B Chapter 30 Nuclear Chemistry 30-1 Structure and Properties of the Nucleus *M p = 1.6726 x 10 -27 kg *M n = 1.6749 x 10 -27 kg *These are called.

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AP Physics B Chapter 30 Nuclear Chemistry 30-1 Structure and Properties of the Nucleus *M p = 1.6726 x 10 -27 kg *M n = 1.6749 x 10 -27 kg *These are called nucleons. *The number of protons in the nucleus is the atomic number….Z *The number of protons plus neutrons …..A *Isotopes of an atom have the same number of protons but different numbers of neutrons. *We use the isotope mass with the natural abundance to calculate the atomic mass of an atom.

30-1 cont’d D=2r=(1.2x 10 -15 m) (A 1/3 ) *See Example 30-1

30-2 Binding Energy and Nuclear Forces See Example 30-2 *The total binding energy of the nucleus represents the amount of energy that must be put into a nucleus in order to break it apart into its protons and neutrons. The average binding energy per nucleon is defined as the total binding energy divided by A. See Example 30-3 30-4

The strong nuclear force is an attractive force that acts between all nucleons- protons and neutrons. It is a short-range force Electrical and gravitational forces are long- range forces. See p 921 for band of stability.

30-3 Radioactivity Henri Becquerel (1852-1908) Marie Curie 1867-1934) Pierre Curie (1859-1906)

30-4Alpha Decay See p 923

30-5 Beta Decay

30-6 Gamma Decay

HW TXT30A Page 940 1-4,6,10-12,19-22,28 due Wed BOP

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