Question

all the exceptionals of metals and non metals

Answer 1

METALS
Sodium and Potassium metals are not strong.
Sodium and Potassium metals are soft and can be cut easily.
NON-METALS
Diamond is a non-metal which is a good conductor of heat.
Graphite is a non-metal which is a good conductor of electricity.
Iodine is a non-metal having lustre.
Diamond is a non metal which is very hard.

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Answer 2

Answer:

(i) Mercury and gallium both are metals but at room temperature, they are in liquid state.

(ii) Metals have high melting point. But mercury is low melting metal.

(iii) Metals generally sink in water due to high density. Exceptions are lithium, sodium and potassium. The density of these elements is lower than that of water and hence they do not sink.

(iv) Most of the non-metals have very low density. Exception is diamond, a form of carbon. Diamond is one of the strongest known substances.

(v) Non-metals are not lustrous, but iodine and graphite are lustrous.

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