10. Chemical Bonding

1. The strength of attraction or repulsion will decide ____________.

2. If attraction is more than the repulsion then atoms ________.

3. If repulsion is more than _________ then the atoms do not combine.

4. Noble gases are more stable.Because they have _______________.

5. The valence electronic configuration of Inert gases(or noble gases or “O” group elements or 18th group elements) is _________ except helium (1s2)

6. All the noble gases have ______________ in the outermost shell, except Helium (He).

7. The valence electron in the atom of an element is depicted in a short form by ___________ or electron dot structure.

8. Electronic theory of valence was given by __________ in 1916.

9. Atoms combine to form a _________.

10. The valence shell fill with eight electrons is called ____________.

11. The force of attraction between any two atoms or a group of atoms that results a stable entity is called a ‘______________’.

12. Sometimes based on the forces being electrostatic, the bond is also called the _________________.

13. As the valence concept has been explained in terms of electrons, it is also called the ________________.

14. The electrostatic attracive force that keeps cation and anion together to form a new electrically neutral compound is called ‘___________’.

15. Generally elements of metals have tendency of losing electron to attain the octet in their valence shell. This property is called as the _____________ or _________________.

16. Elements with more electropositive character form _________.

17. The electrons shared between two atoms belong to both the atoms and the sharing of electrons between them leads to the formation of a chemical bond known as _____________.

18. Bond length or bond distance is generally given in __________ or __________.

19. An angstrom (Å) is a unit of length equal to ____________________________.

20. 1 nanometer = .

21. Valence – shell – electron – pair repulsion – theory (VSEPRT) was proposed by ___________.

22. Valence – shell – electron – pair repulsion – theory (VSEPRT) was further improved by _______________.

23. If two bond pairs are present in two covalent bonds around the nucleus of the central atom without any lone pairs in the valence shell, they must be separated by ________ to have minimum repulsion between them.

24. The valence shell separated by the angle 1800 .Thus, the molecule would be _________.

25. If three bond pairs are there in three covalent bonds around the nucleus of the central atom, without any lone pairs they get separated by _______ along three corners of a triangle.