Sulphur (S) is a yellow solid element, which (like carbon) will not dissolve in water, but can be dissolved in other chemicals. Sulphur itself has no odor, but it readily unites with oxygen, even at low temperatures. It also burns readily, producing in both cases an oxide of sulphur (SO 2) with the familiar, suffocating odor which we wrongly associate with sulphur itself.
Its importance in biology is due to the fact that it is a part of the living substance of all organic things though in smaller amounts than any of the preceding elements.
Mustard, onions, and eggs will blacken silver dishes. This is due to the sulphur compounds which they contain; but sulphur, in smaller quantities, is found hi all plants and animals.
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