The Periodic table

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The Periodic table

• The periodic table is a way of keeping track of
  all of the elements. Each element has a symbol.
  Some symbols are only one capital letter (Example
  hydrogen H), but some sumbols are two letters.
  A two letter element symbol is always a capital
  letter followed by a small letter (Example
  Calcium- Ca)

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The Periodic Table

• The periodic table is arranged in the way it is
  for a reason!
• Look at the imaginary periodic table you drew
  Bohr diagrams on.
• What do you notice about all the elements in the
  same column?

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• The columns on the periodic table are called
  groups or families.
• Each family has the same number of electrons in
  their outer shell.

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• Each family also has a number (at the top of the
  column).
• This number is the same as of outer shell
  electrons.
• This is an easy way to double check your work
  when drawing Bohr models.

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• Some of the important families have names
• Alkali metals - Group 1
• Alkaline Earth Metals - Group 2
• Chalcogens - Group 6A (16)
• Halogens - Group 7A (17)
• Noble Gases - Group 8A (18)

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• The families react the same way, chemically, in
  most situations.
• The only difference is, as you go further down
  the periodic table, they get more reactive.
• How quickly and strongly something reacts with
  something else is called reactivity.

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• The rows across the periodic table are also
  numbered.
• There are called rows or periods (hence the
  name).
• Look at your Bohr models again. What do you
  notice about the numbers of rows?

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• Thats right!! The number of the rows is equal to
  the of shells we need to put electrons in.
• Another easy way to check your work!

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• Now look at the periodic table in the back of
  your text.
• Green symbols represent metals.
• Think about metals you have seen. List some
  properties of metals.
• Shiny Ductile Malleable
• Conduct heat electricity

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• The orange elements are called non-metals.
• List some properties of non metals.
• Dull
• Brittle
• Poor conductors (insulators)

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• The purple elements are called metalloids.
• This means that they sometimes act like metals,
  and sometimes act like non-metals. They cant
  make up their minds!

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• Right through the metalloids runs something
  called the staircase.
• This separates metals (on the left side) from the
  non-metals (on the right side).

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