Wed, Jan 28

1
Wed, Jan 28

• Schedule changes
• 2/2, M              6          Ch. 2     
• 2/4, W             7          Ch.2       Quiz
  2         
• 2/9, M              8       Ch. 1, 2  Test 1

2
Monday - Feb 2, 2009

• Quiz 1 return/?s, Homework chapter 1 return
• Schedule
• Isotopic Abundance/Average molecular mass
• The periodic table
• Periods, Groups, Trends
• Metals, Nonmetals, Metalloids
• Main group elements
• Transition elements
• Compounds

3
The Atomic Theory Today Isotopes and Atomic
Masses of the Elements

• Nitrogen has two naturally occurring isotopes.
  14N has an atomic mass of 14.003074 amu and 15N
  has an atomic mass of 15.000109 amu. What is the
  percent abundance of each isotope if the atomic
  mass of nitrogen is 14.0067 amu?

4
The Atomic Theory Today Isotopes and Atomic
Masses of the Elements

• 14N has a percent abundance of 99.63
• 15N has a percent abundance of 0.37

5
Wed, Feb 4

• Schedule changes
• 2/4, W             7          Ch.2       Quiz 2 
• Problem review 4,7,15,39,42,43,49,51        
• 2/9, M              8       Ch. 1, 2  Test 1
• Ch1, Ch2, tools

6
2.6 Regions of the Periodic Table

• Rows - periods
• Columns families/groups
• Main group
• Transition elements

Kull Chem 105 Chapter 2
7
2.6 The Periodic Table Periods rows
Groups/Families columns
Kull Chem 105 Chapter 2
8
Periodic Table

• Typical Ions formed
• Main group gain or lose to equal nearest noble
  gas

9
Compounds

• Ionic
• Covalent

10
The Atomic Theory Today Isotopes and Atomic
Masses of the Elements

• Magnesium has three naturally occurring isotopes.
  24Mg has an atomic mass of 23.985045 amu, 25Mg
  has an atomic mass of 24.985839 amu and 26Mg has
  an atomic mass of 25.982595 amu. If 26Mg has a
  percent abundance of 11.10 , what is the percent
  abundance of the other two isotopes if the atomic
  mass of magnesium is 24.312 amu?

11
The Atomic Theory Today Isotopes and Atomic
Masses of the Elements

• 24Mg has a percent abundance of 78.90
• 25Mg has a percent abundance of 10.00

12
The Atomic Theory Today Isotopes and Atomic
Masses of the Elements

• Bromine has two naturally occurring isotopes.
  79Br has a percent abundance of 50.69 and 81Br
  has a percent abundance of 49.31 . If 79Br has
  a mass of 78.918336 amu, what is the atomic mass
  of 81Br?

81Br has an atomic mass of 80.92 amu
13
The Atomic Theory Today Isotopes and Atomic
Masses of the Elements

• 24Mg has a percent abundance of 78.90
• 25Mg has a percent abundance of 10.00

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