Definition: A chemical bond is defined as a force that acts between two or more atoms to hold them together as a stable molecule.
Main types of bond:
- Ionic or electrovalent bond,
- Covalent bond,
- Coordinate covalent bond
Forth type of bond:
Metallic bond: The type of bonding which holds the atoms together in metal crystal.
Valence electron: The electrons in the outer most energy level in an atom that takes part in chemical bonding are called valence electrons.
Bonding electrons: The valence electrons actually involved in bond formation are called bonding electrons.
Octet rule: In chemical bond formation, atoms interact- (i) by losing, (ii) by gaining or (iii) by sharing electrons to acquire a stable noble gas configuration.
He (2) 2
Ne (10) 2, 8
Ar (18) 2, 8, 8
Kr (36) 2, 8, 18, 8
Xe (54) 2, 8, 18, 18, 8
Rn (86) 2, 8, 18, 32, 18, 8
The tendency for atoms to have eight electrons in the outer shell is known as Octet rule.