Non- Metals

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 0.00008 None Nitrogen N -210 -196 0.025 0.00117 Oxygen O -219 -183 0.267 0.00133 Sulphur S 115 445 0.269 1.96 Yellow Chlorine C l -101 -34 0.009 0.00299 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

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

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

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

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

Phosphorus

Chlorine

Nitrogen It prevents premature explosions Reduces chances of corrosion

Hydrogen

Oxygen