1. Who invented Atomic theory ?

Answer: Dalton of Britain in 1803.

2. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

3. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

4. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table

5. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

6. Who invented Vitamin K ?

Answer: Doisy Dam of U.S.A. in 1938.

7. Who invented Vitamin D ?

Answer:

Edward Mellanby discovered Vitamin D while researching a disease called rickets in 1922