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  • Today I am going to talk about elements.
  • H
  • As you see there is a letter 'H' on the blackboard, it is the atomic symbol of hydrogen. Hydrogen is one of the constituent elements of water.
  • H
  • O
  • Then, the another constituent element of water is oxygen. It's atomic symbol is 'O'. The percentage composition of oxygen is 21%. It is the second highest percentage composition in the air.
  • C
  • The next one is 'C'. It represents the element, carbon. It contains 0.03% in the air. You can get it when you break down carbon dioxide (CO2).
  • C
  • There are some same physical properties of these three elements. They are odorless, tasteless and in the form of gas. Last but not least, as they are in form of gas, they are also good insulators.
  • C
  • Are there any questions?
  • No
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