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

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

3. Manometer is used for the determination of

4. In a group the elements have almost same

5. The matter exists in

6. The different forms of element are called

7. The air is  a

8. Chemistry is the branch of science that deals with

9. The most electronegative element in periodic table is

10. Corrosion of metals is a .................reaction

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

12. Neil Bhor mainly concentrated upon

13. The Atom is a Greek word

14. The electro planting prevents

15. Oxidation is the process of adding oxygen and removing

16. Steel is the alloy of

17. Chemical reactions involve migration of

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

19. The Atoms can exist freely in nature

20. The KCI has the type of bonding