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Drob222

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C8H18 looks right for what you wrote; however, I think you made a typo. Are you sure that isn't hexEne? I don't think there is a compound named 2,5-dimethyl-3-hexane but there is a 2,5-dimethyl-3-hexene and a 2,5-dimethyl-3-hexyne.
Look at the periodic table. Li is in I so it has a valence of +1. S is in group VI (or 16 depending upon the system you are using) and it has a valence of -2; therefore, the formula is Li2S (Note that Li at +1 each is +2 total and that is neutralized by
Yes, but it's hard to explain without a whiteboard. However, I'll try. Count electrons by themselves. Count electrons in a bond as belonging to each atom equally; that is, if two electrons make a bond then 1 electron belongs to one element and the other

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