Types of Chemical bonds

Simple types

1. Directorate of Staff Development Punjab, Lahore Induction Level training of SSE(Bio- Chem ) at Govt. High School Lodhran

2. Contents Definition of chemical bonding Types of chemical bonding Ionic bond Covalent bond Coordinate covalent bond Metallic bond

3. What is Chemical Bond? A force that holds two or more atoms of same or different elements together called chemical bond.

4. Ionic bond Covalent bond Coordinate covalent bond Metallic bond Types of chemical bonds

5. Ionic Bond A bond formed by the transfer of valence electron of metal atom to the outer most shell of non metals atom Key: Metal + Nonmetal

6. Properties of Ionic Compounds

7. Covalent Bond A bond formed by the mutual sharing of valence electron between the atoms. Key: Nonmetal + Nonmetal

8. Non-polar covalent bond A bond formed by the mutual sharing of electrons between atoms of same element.

9. Polar Covalent bond A bond formed by the mutual sharing of electrons between the atoms of different elements.

10. Properties of Covalent compounds Low melting points and boiling points. Mostly insoluble in water Low enthalpies of fusion and vaporization Mostly in liquid or gaseous state Poor electrical and thermal conductivity

11. Coordinate Covalent bond A bond formed by the sharing of electrons but shared pair donated by one of the atoms called donor while other that accept called acceptor.

12. Metallic bond A bond in which metallic cations are held together by sea of delocalized electrons. Key: Metal + Metal

13. Properties of Metallic solids High thermal and electrical conductivity. Luster and high reflectivity. Malleability and ductility. (They can be beaten or shaped without fracture) Variability of mechanical strengths (ranging from soft alkali metals to Tungsten, which is hard)

14. Questions to clear the concept Which bond is in all gases? Which bond is in all metals? Which bond is in most of slats? Which bond is in liquids?

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