TOSSUPS – ROUND N

It is a non-metal that is soft and low density, and has allotropic forms in any phase. Alchemists gave it its own symbol, a triangle atop a cross. It is a principal ingredient in gun powder and is found in match heads. Often colored yellow and found in a 8 membered ring, this is FTP what element, number 16 on the periodic table? Answer: sulfur. 21. ................
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