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The Periodic Table Organization Simple_Periodic_Table_Chart-en, group…

- - - - columns from 0 to VII.
      - elements in a group have similar properties.
      - the numbers represents how many outer shells there are in the atom (except group 0).
    - - rows from 0 to 7.
      - the number represents how many electron shells the atom in the row has.
    - - 80% of elements are metals.
      - the red elements are metals, blue ones are nonmetals and yellow ones are metalloids. (Picture to the right).
    - - are used to predict how an element in a group will behave.
      - Example: As you go down Group I, elements become more reactive.Vice versa for Group VII.
    - - sits alone.
      - it has 1 outer electron, like Group I metals but it's a gas and non-metal.
    - - created in a lab .
      - radioactive and toms break down quickly.
      - Examples: lawrencium, neptunium, etc.
- - - - softness increases.
      - density inreases.
      - melting point decreases.
      - reactivity increases.
  - - - violent and vigorous reactions giving hydrogen and a hydroxide.
    - - heating this elements and plunging them into jars of chlorine, creates flames.
      - the flames form bright chlorides.
    - - heating this elements and plunging them into jars of oxygen, creates flames.
      - flames burn fiercely to form oxides.
- - - - As you go down the table..
        
        color gets deeper.
        
        density increases.
        
        boiling points increase.
  - - - Accept electrons, forming halide ions.
    - - Share electrons, forming molecules with covalent bonds.
    - - will displace a less reactive halogen from a solution of its halide.
- - - - As you go down the table...
        
        the atom increases in size and mass.
        
        density increases.
        
        boiling points increase.
  - - - reason they are called "noble".
      - because the atoms already have stable outer shells.