(a) Name two physical properties each of sodium and carbon in which their behaviour is not as expected from their classification as metal and non-metal respectively.

(b) Name two metals whose melting points are so low that they melt when held in the hand.

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1 Answers

(a) Sodium metal: Soft, low melting point Carbon non-metal: graphite conducts electricity; diamond has a very high melting point.

(b) Gallium and cesium.

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