1. The Atom is a Greek word

2. The Atoms can exist freely in nature

3. The matter exists in

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

5. The different forms of element are called

6. In a group the elements have almost same

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

8. The most electronegative element in periodic table is

9. Steel is the alloy of

10. The electro planting prevents

11. The KCI has the type of bonding

12. Manometer is used for the determination of

13. Chemistry is the branch of science that deals with

14. Chemical reactions involve migration of

15. Neil Bhor mainly concentrated upon

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

17. Oxidation is the process of adding oxygen and removing

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

19. The air is  a

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