Which of the following non-metal shows an exceptional physical property?
Physical Properties of non-metals
(i) Non-metals are generally bad conductor of heat and electricity.Non-metals do not conduct the electric current due to absent of free or mobile electrons.
Exception : Graphite is a good conductor of electricity.
(ii) Non-metals are generally soft. (Exception : Diamond is the hardest natural substance.)
(iii) Non-metals have low melting and boiling points. (Exception : Graphite has very high melting point (i.e. 3730 ∘C).)
(iv) Non-metals have low density. (Exception: Diamond has high density.)