(a) What are (i) metals (ii) non-metals, and (iii) metalloids? Give two examples each of metal, non-metals and metalloids.
(b) Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
(a) (i) Metals are elements that are malleable, ductile and conduct electricity.
Example: Aluminium and zinc
(ii) Non-metals are elements that are neither malleable nor ductile and they do not conduct electricity. But most of the non-metals are brittle.
Examples: Phosphorus and hydrogen
(iii) Metalloids are the elements that shows properties of both metals and non-metals.
Examples: Germanium and silicon.
(b) Metals – Mercury, Sodium
Non-metals – Diamond, Sulphur, Iodine, Carbon, Boron
Metalloids – Silicon, Germanium