lesson 5

• Dmitri Mendeleev

  He is a Russian chemist who developed the periodic classification of the elements .
• Elements

  are substances that are made up of only one type of atom, cannot be broken down to simpler forms
• Element symbol

  Chemical symbols are always written using one or two letter abbreviation for the name of the element
• Classifying elements Grouped into three:

  metals, non metals and metalloids
• Uses of elements

  Elements are essential in our everyday life and necessities