<P> Graphite , named by Abraham Gottlob Werner in 1789 , from the Greek γράφειν ( graphein , `` to draw / write '' , for its use in pencils ) is one of the most common allotropes of carbon . Unlike diamond , graphite is an electrical conductor . Thus , it can be used in , for instance , electrical arc lamp electrodes . Likewise , under standard conditions , graphite is the most stable form of carbon . Therefore , it is used in thermochemistry as the standard state for defining the heat of formation of carbon compounds . </P>
<P> Graphite , named by Abraham Gottlob Werner in 1789 , from the Greek γράφειν ( graphein , `` to draw / write '' , for its use in pencils ) is one of the most common allotropes of carbon . Unlike diamond , graphite is an electrical conductor . Thus , it can be used in , for instance , electrical arc lamp electrodes . Likewise , under standard conditions , graphite is the most stable form of carbon . Therefore , it is used in thermochemistry as the standard state for defining the heat of formation of carbon compounds . </P>
which of the allotrope of carbon is a constituent of a lead pencil
which of the allotrope of carbon is a constituent of a lead pencil
Graphite
Graphite