Tuesday September 29, 2015 HOMEWORK

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Tuesday September 29, 2015 HOMEWORK TO DO RIGHT NOW: Have a seat in your old seat  Title page 42- UNIT 3 “Atomic Theory” Page 43- Parts of the Atom Notes Page 44- The History of Atomic Chemistry Notes Update your table of contents HOMEWORK Due Thursday  Atomic Structure Worksheet REMINDERS Quiz on FRIDAY No tutorials tomorrow Tutorials are 7:00-7:25 am and 2:40-3:00pm (quick questions only Get scientific calculator!!! Check grades online!

Atom The smallest particle of an element (that keeps the properties of the element). Three types of subatomic particles: Proton (p+) Neutron (n0) Electron (e-)

Reading the Periodic Table Atomic Number = # of p+ Atomic Number Element Symbol Element Name Atomic mass Since atom is neutral p+ = e- Atomic mass = p+ + n0

Bohr model of the atom Yep! Somebody lied when they told you 8! We’ll go into details in Unit 4.

1. Draw five protons in the nucleus of the atom 1. Draw five protons in the nucleus of the atom. Label them with their charge. 2. Draw six neutrons in the nucleus of the atom. 3. Draw two electrons in the first energy levels and label them with their charge. 4. Draw three electrons in the second energy level and label them with their charge. 5. What element is represented by the diagram? - - + Boron

Identify this atom: (assuming it is neutral p+ = e-) NUCLEAR NOTATION 16 O 8  HYPHEN NOTATION Element Symbol – Atomic mass Oxygen -- 16

Atom Boards Protons Electrons Neutrons

Calcium Boron Element Symbol Mass Atomic # Proton Neutron Electron Ca Boron Ca 40 20 20 20 20 B 11 5 5 6 5