Differences between the properties of metals and non-metals

2 marks · Easy

Diamond is a form of carbon, a non-metal, but it is the best conductor of heat of all the elements. Explain why diamond is still considered a non-metal despite this property.

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Diamond is considered a non-metal because it does not conduct electricity, is brittle, and does not show metallic lustre, even though it conducts heat well.

Also accept: Diamond is a non-metal because it is not shiny like metals, is brittle, and does not conduct electricity.; Diamond does not have the other typical properties of metals (does not conduct electricity, not malleable).

Common mistakes: Diamond is a metal because it conducts heat.

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Marking points

B1 · 1 mark · Explains diamond lacks other metal properties (e.g., does not conduct electricity, is brittle, not shiny).

B2 · 1 mark · Describes that conductivity of heat does not make a substance a metal; other properties must be considered.

Worked solution

Diamond is a non-metal because it does not conduct electricity and is brittle, even though it conducts heat extremely well. It does not have the metallic lustre or malleability of metals.