Because they form bonds which are easily broken by heat only one or 2 max. This provides electrons for passage of current by conduction I'd obstructed with resistance more than a conductor.
Metalloid or semi metals are those substances which has a valency of 4. In some cases they act as a metal and in some cases they act as a non metal. For example: Silicon, it has a metallic luster but...
Together with the metals and nonmetals, the metalloids (in Greek metallon = metal and eidos = sort - also called semimetals) form one of the three categories of chemical elements as classified by...