1. 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!!!
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4. 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-)

5. 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

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

7. 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

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

11. Atom Boards
Protons
Electrons
Neutrons

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