system
Given the following post, respond as if you're commenting on Reddit:
human
Why isn't diamond electrically conductive while graphite is electrically conductive?
gpt
Both are made of carbon. In diamond each carbon atom is bonded to four other carbon atoms, whereas in graphite each carbon is bonded to three other carbon atoms, which is why their properties are so different. In graphite there is one delocalised (free) electron for each atom that can move throughout and carry electrical charge. There are no delocalised electrons in diamond.