Chemistry - Bonding

• Solids at room temperature
• High melting points
• Soluble in water
• Insoluble in organic solvents (eg. petrol)
• Hard solids
• Brittle solids
• Insulators in the solid state
• Conductors in the liquid state

The valency of an atom can be worked out using it's group no.

The valency of an atom is equal to:

1.) The number of charges of the ion that the atom will form.

2.)For covalent bonds, the number of covelant bonds that the atom will form.

Group No. - Valency

1 -------------1

2--------------2

3--------------3

4 -------------4

5 -------------3

6 -------------2

7------------- 1

8------------- 0

Group No. - Valency

7------------- 1

8------------- 0

• Can be solids, liquids or gases at room temperature
• Low melting points when solid
• Low boiling points when liquid
• Insoluble in water
• Soluble in organic solvents (eg. petrol)
• Insulators in all states