1. Non- Metals

2. Based on the table below what can you say about the physical properties?
Name
Symbol
m.pt
b.pt
Thermal conductivity
Density
Colour
Hydrogen H
-259
-253
0.181
None
Nitrogen N
-210
-196
0.025
Oxygen O
-219
-183
0.267
Sulphur S
115
445
0.269
1.96
Yellow
Chlorine
C l
-101
-34
0.009
green
Low melting & boiling points
Low densities
Poor heat conductivity
Dull in colour
Poor electrical conductors
Low in sonority
Brittle- not malleable & ductile like metals

4. Low m.pt, b.pt. Gases have a much lower b.pts and m.pts
Non- metals
Exist mainly as
Occur naturally in free state- N2, O2
Combined- chlorides, oxides
Solids- C, S, P, Si
Gases- H2, N2, O2, Cl2
shows
Some have
Allotropy, xcpt Si
Giant molecular structures- C, Si
Simple molecular structures- S, P, Cl2, O2, H2, N2
Low m.pt, b.pt. Gases have a much lower b.pts and m.pts
High m.pt, b.pt

5. Carbon Strong covalent bonds make diamond very hard.
Weak intermolecular forces between layers- that make up graphite.

6. Sulphur burns easily & quickly Has antibacterial property
Possesses bleaching action
Able to form links between polymer chains
Can be oxidised

7. Silicon Semi-conducting property
Usually found combines with oxygen as silica- sand or silicates for- clays

8. Phosphorus

9. Chlorine

10. Nitrogen
It prevents premature explosions
Reduces chances of corrosion

11. Hydrogen

12. Oxygen