Question

为甚么铅笔芯可以导电

Answer 1

铅笔芯用石墨或碳造
石墨目前主要用途是耐火材料的原材料，尤其是镁碳砖。自然界自然形成的石墨可分为鳞片石墨和土状石墨。鳞片石墨主要产地在中国黑龙江的柳毛、萝北，内蒙古的兴和，山东的平度等地。土状石墨主要产地在湖南的郴州和吉林的磐石。碳是一种非金属元素，位于元素周期表的第二周期IVA族。它的化学符号是C，它的原子序数是6，电子构型为[He]2s22p2。碳是一种很常见的元素，它以多种形式广泛存在于大气和地壳之中。碳单质很早就被人认识和利用，碳的一系列化合物——有机物更是生命的根本。 2011-12-08 18:07:46 补充： 石墨或碳是导电材料
所以可以导电。
参考: ckk
ckk
The material used in pencil is "graphite"(石墨)
which is an allotrope of carbon. Graphite can conduct electricity due to vast "electron delocatization" within the carbon layers
a phenomenon called "aromaticity". In graphite
each carbon atom is covalently bonded to only three neighbouring carbon atoms and these form layers of hexagonal neork which are separated by a large distance. The fourth valency electrons remain free which enable an easy flow of electron through graphite and that is why it is made a good conductor of electricity. As a parison
the electrical conductivity of graphite is about 10^5 S/m
whereas that of copper (a good eelctrical conductor) is 6 x 10^7 S/m. Hence
graphite conduct electricity about 100 times lower than copper. The electrical conductivities of glass or rubber (which are mon electrical insulators) are about 10^-14 S/m
this makes graphite a conductor but not an insulator. The following web-page gives a detailed explanation on the electronic struture of graphite atoms that makes it an electrical conductor
phyp.technion.ac.il/~david/thesis/node3
铅笔芯系用碳或石墨制造，碳可以导电。