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

2. The KCI has the type of bonding

3. Oxidation is the process of adding oxygen and removing

4. Neil Bhor mainly concentrated upon

5. Chemistry is the branch of science that deals with

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

7. In a group the elements have almost same

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

9. Manometer is used for the determination of

10. The Atom is a Greek word

11. The air is  a

12. The different forms of element are called

13. Chemical reactions involve migration of

14. The matter exists in

15. The Atoms can exist freely in nature

16. The most electronegative element in periodic table is

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

18. Corrosion of metals is a .................reaction

19. Steel is the alloy of

20. The electro planting prevents