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THE PERIODIC TABLE

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THE PERIODIC TABLE Powered By Docstoc
					     THE PERIODIC TABLE
Objectives
• To be able to identify groups and periods
  in the periodic table
• To know the positions of group1, group 0
  and group 7 in the periodic table
• To know the positions, properties and
  uses of the halogens
• Read through the slides and then
  complete the linked worksheets
      THE PERIODIC TABLE

• The rows across the elements in the
  periodic table are called periods
• The columns down are called groups.
• The groups are numbered from 1 to 8
• Group 8 is also called group 0.
         SOME GROUPS

• Group 1 are found on the far left side
  and are called the alkali metals
• Group 7 are found at the right hand
  side and are called the halogens.
• Group 8 are also known as group 0
  and are called the noble gases
               GROUP 7
These elements are all non- metals.
They are also called the halogens
They are:-
                 Fluorine
                 Chlorine
                 Bromine
                  Iodine
• They have low melting points (this means
  that the change from a solid to a liquid at a
  low temperature)
• They do not conduct electricity
• They go around as pairs of atoms.
• We call them diatomic molecules
• We write them like this
• Fluorine - F2
• Chlorine - Cl2
• Bromine - Br2
• Iodine    - I2
         What are they like?

•   Fluorine is a very pale yellow gas
•   Chlorine is a green gas
•   Bromine is a dark red brown liquid
•   Iodine is a black shiny solid
       THE REACTIONS OF THE
            HALOGENS
• The halogens like to take      most
•The halogens like reactions
    part in chemical to take    reactive
part in chemical reactions
• The react with metals to
•The react with metals to
    make salts
make salts
• The most reactive
•The most reactive halogen
     fluorine is fluorine and
 is halogen and the least
    the least reactive
reactive is iodine. is
    iodine.
•They get less reactive
• Theygo down the group
as you get less reactive as
    you go down the group       Least
                                reactive
      Uses of the halogens

• Iodine is used as an antiseptic
• Chlorine is used in swimming pools to
  kill bacteria
• Fluorine is used in tooth paste
• Bromine is used photographic film
Click here and complete the
worksheet

Click here to complete the
reactions of the halogens
Click here to go to part 3

				
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