C4- Chemical Patterns

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The Periodic Table

In the periodic table, the elements are arranged in rows, one above the other. Each row is a period. The most obvious repeating pattern is from metals on the left to non-metals on the right. Every period starts with a very reactive metal in group 1 and ends with a unreactive gas in group 8. 

Elements with similar properties fall into a column. Each column is a group of similar elements. 

On the periodic table each element is in a box containing two numbers. The number above the element symbol is called the relative atomic mass. The number below the element symbol is called the proton number. 

The Alkali Metals 

  • very reactive 
  • They are so reactive that they have to be kept under oil to stop the reacting with oxygen or moisture in the air. 
  • They are called alkali metals because when they react with water they produce a solution that is alkali. 

Note that it is the compounds of these metals which are alkalis and not the metals themselves. 

  • able to be cut with a knife
  • shiny but tarnish quickly in air. 
  • good conductors of electricity. 
  • they float on water 
  • melt on gentle heat

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