1. The matter exists in

2. The electro planting prevents

3. The most electronegative element in periodic table is

4. In a group the elements have almost same

5. When a covalent bound is formed  by a single electron pair termed as a

6. The sum of masses of all atoms in a molecule is called

7. Manometer is used for the determination of

8. The Atoms can exist freely in nature

9. Chemical reactions involve migration of

10. Oxidation is the process of adding oxygen and removing

11. Chemistry is the branch of science that deals with

12. The different forms of element are called

13. When a covalent bound is formed  by two electron pair termed as a

14. ..............is homogenous mixture of two or more substances

15. The air is  a

16. Corrosion of metals is a .................reaction

17. The KCI has the type of bonding

18. The Atom is a Greek word

19. Steel is the alloy of

20. Neil Bhor mainly concentrated upon