Do Now  Write down anything about which you are unclear for the following topics:  Atomic Theory  Nuclear Chemistry  Electron configurations

Unit 2 Review Day Williamsburg High School for Architecture and Design Mr. Quinn and Ms. Tom 11/7/13

Aim  How is the atom constructed?

Atomic Theory Overview  Plum Pudding Model  Electrons  Rutherford Model  Nucleus  Bohr Model  Orbits  Wave Mechanical Model  Orbitals

Check Yo’ Self, Part 1  What particles are located inside the nucleus?  What is the sign of the charge of a nucleus?  What is the charge of a proton?  What is the mass of a proton and neutron?  What is the sign of a charge on an electron?

The Nucleus: an Overview  Atomic Number  Atomic mass  Isotopes  Nomenclature  Number of protons  Number of protons + neutrons  Same protons, different neutrons

Check Yo’ Self, Part 2  How many electrons, protons, and neutrons does a Kr-85 atom have?  Which isotopic notation represents an atom of carbon-14? C C C C

Nuclear Chemistry  Half-Life  Definition  Equation  Nuclear Decay Equations  The time for half of a radioactive sample to decay

Check Yo’ Self, Part 3  If an object has decayed for 3 half-lives, what fraction of the original remains?  Balance the following nuclear decay equation:  _________________ → 4 2 He Pb

Electron Configurations  Bohr Model: shells  Wave Mechanical model: orbitals

Check Yo’ Self, Part 4 Part 1  A bromine atom in an excited state could have an electron configuration of  Identify 2 gases in the mixture

Check Yo’ Self, Part 4 Part 2  Write the electron configuration for phosphorus in the ground state using orbital and electron spin notation.

Now, it’s your turn!