CHEMICAL BOND 

*also known as INTRAMOLECULAR FORCE

*involves interaction of atoms

*an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. 

TWO TYPES OF CHEMICAL BOND

IONIC BOND

*transfer of electron between metal and non-metal

• atoms with 1 to 4 electron gives up its own electron to become stable and it become positively charged (+)

• atoms with 5 to 7 electron accept another electron to become stable and it become negatively charged (-)

EXAMPLE:

In this example, Sodium(Na) transferred or gives up its electron to Chlorine to become stable;it becomes positively charged. In the other hand, Chlorine(Cl) accepts the electron from the Sodium to become stable;it becomes negatively charged.

COVALENT BOND

*sharing of electrons between two non-metals

• the electrons are shared to one another to become stable

EXAMPLE:

           

In this example(CH4), the atoms only shared their electrons but not transferred.

IONIC PROPERTIES

Crystalline solids (made of ions) High melting and boiling points Conduct electricity when melted Many soluble in water but not in non polar liquid

COVALENT PROPERTIES

1. Gases, liquids, or solids (made of molecules)
2. Low melting and boiling points
3. Poor electrical conductors in all phases
4. Many soluble in non polar liquids but not in water