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1.The term atom was introduced by                                           - Ostward

2.The first atomic theory was postulated by                               - John Dalton

3.The term molecule was introduced by                                    - Avogadro

4.Wave mechanical model of atom was introduced by              - Max Plank

5.The nuclear model of atom was introduced by                       - J.J Thomson

6.The smallest atom                                                                   - Helium

7.Neutron was discovered by                                                     - James Chadwick

8.The lightest metal                                                                   - Lithium

9.The acid present in vinegar is                                                - Acetic acid

10.Tea contain                                                                          - Tannic acid         
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