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Science (Unit-2) - Coggle Diagram

- - - - Valency is +1
  - - - Valency is -1
  - - - Valency is 0
- - - - There are 118 elements
        
        They are arranged in the Periodic Table
- - - - Sodium has 1 extra electron
        
        Chlorine has 1 less electron
        
        Sodium gives its electron to calcium
        
        Both of them form Ions
        
        Then they are attracted as substances with Ionic Bonds
  - - - Chlorine has one less electron in its outer shell
        
        It finds another Chlorine atom and they share an electron
        
        They form Covalent Bonds