1. In a group the elements have almost same

2. The Atoms can exist freely in nature

3. Steel is the alloy of

4. The different forms of element are called

5. The KCI has the type of bonding

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

7. Chemistry is the branch of science that deals with

8. Manometer is used for the determination of

9. Oxidation is the process of adding oxygen and removing

10. The air is  a

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

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

13. The matter exists in

14. Corrosion of metals is a .................reaction

15. Chemical reactions involve migration of

16. Neil Bhor mainly concentrated upon

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

18. The most electronegative element in periodic table is

19. The Atom is a Greek word

20. The electro planting prevents