Which of the following non metals show/s an exceptional physical property/ies?
Both graphite and diamond
Some physical properties of non-metals:
(i)Non-metals are generally bad conductors of heat and electricity.
Exception : Graphite is a good conductor of electricity.
Non-metals do not conduct the electric current due to absence of free or mobile electrons, but graphite, due to presence of mobile electron is able to conduct electricity.
(ii)Non-metals are soft (Exception : Diamond)
(iii)Non-metals have low melting and boiling points. (Exception : Graphite has very high melting point (3730∘C)