(a) Name two physical properties each of sodium and carbon in which their behaviour is not as
(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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(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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