A Guided Tour of the Periodic Table

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A Guided Tour of the Periodic Table Powered By Docstoc
					The Periodic Table
     Chapter 5.1
             Periodic Table
• Created by Dmitri Mendeleev; arranged in
  increasing mass number.
• Modern Periodic table is arranged according
  to increasing atomic number.
     Parts of the Periodic Table
• Groups
  – Vertical columns
  – 1-18
  – Elements have similar properties
• Periods
  – Horizontal rows
  – 1-7
 Identify the element given its group number
              and period number.
1)   Group 2; period 3
2)   Group 14; period 5
3)   Group 6; period 4
4)   Group 16; period 2
5)   Group 11; period 5
6)   Group 1; period 6
7)   Group 18; period 1
 Identify the element given its group number
              and period number.
1)   Group 2; period 3    magnesium
2)   Group 14; period 5   tin
3)   Group 6; period 4    chromium
4)   Group 16; period 2   oxygen
5)   Group 11; period 5   silver
6)   Group 1; period 6    cesium
7)   Group 18; period 1   helium
Group Number & Valence Electrons
• The group number indicates the number of
  valence electrons.
    Group Number    Number of Valence
                    Electrons
            1                 1
            2                 2
            13                3
            14                4
            15                5
            16                6
            17                7
            18       8 (except Helium has
                            only 2)
 Period Number & Energy Levels
• The period number indicates the number of
  energy levels present in the atom.
        Period Number   Number of Energy
                        Levels
                1                1
                2                2
                3                3
                4                4
                5                5
                6                6
                7                7
               Practice Problem:
Element           Number of Valence   Number of Energy
                  Electrons           Levels
          Ar

          Sr

          Si

      Na

          F

          Po

          Ga
           Practice Problem:
Element       Number of Valence Number of
              Electrons         Energy Levels
     Ar               8                 3
      Sr              2                 5
      c               4                 2
      H               1                 1
      F               7                 2
     Po               6                 6
     Ga               3                 4

				
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posted:5/7/2013
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