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Who on Earth told you that?
But yes, I am a chemist. Sorry I've taken a little while to respond, I don't check this as often as I used to.
The ability to conduct electricity comes down to the ability for a substance to carry and transport electrons. Metallically bonded substances are very good at this because electrons are delocalised across the entire lattice structure of the metal (i.e. they essentially swim around the atoms). Ionically bonded compounds also conduct electricity fairly well (depending on the compound), because in such a system the two components both carry charge and are therefore capable of conducting electricity. For example, when in solution, table salt (NaCl) dissociates into Na+ and Cl- ions. Tap water also contains calcium and magnesium ions, among others, which is why is conducts electricity.
Non-metallic substances and ones that are covalently bonded typically do not posses this property. the reason is simply that they are not very good at it. Sounds stupid, but that's the simple answer. The outer most energy level of metallic atoms contain valence electrons that are very easy to pull off, making the atom positively charged. Electrons are more or less free to move around and this gives it its conductivity.
In its solid state, sulphur exists as a covalently bonded cluster type structure; typically octasulphur, which is simply 8 sulphurs bound together in a ring. The result of the covalently bonded structure of sulphur means that electrons are not free to move around - they are 'trapped' in the bonds that exist between the sulphur atoms. Because of this, sulphur cannot conduct electricity.
What do you mean by liquid state? Native sulphur is solid, so are you referring to a particular compound other than that or are we talking about dissolved sulphur?
Now, I don't know if I've explained that very well. I'm not a physical chemist even in the slightest (synthetic organic chemistry), so I may have come across a bit muddled.
Feel free to ask more questions here if you need, otherwise you could write a thread in a science forum so that your questions get attention by people who know the answer better than I do. *
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