Tuesday September 29, 2015 TO DO RIGHT NOW: 1.Have a seat in your old seat 2.Title page 42- UNIT 3...
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Transcript of Tuesday September 29, 2015 TO DO RIGHT NOW: 1.Have a seat in your old seat 2.Title page 42- UNIT 3...
Tuesday September 29, 2015
TO DO RIGHT NOW:
1. Have a seat in your old seat 2. Title page 42- UNIT 3 “Atomic Theory”3. Page 43- Parts of the Atom Notes4. Page 44- The History of Atomic Chemistry Notes5. 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
Since atom is neutral p+ = e-
Element Symbol
Atomic massElement Name
Atomic Number = # of p+
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. 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
16O8
HYPHEN NOTATION
Element Symbol – Atomic mass Oxygen -- 16
Atom Boards
Protons
Electrons
Neutrons
Element Symbol Mass Atomic # Proton Neutron Electron
Calcium
Boron
Ca 40 20 20 2020
B 11 5 5 56