phosphorus means please send me a means
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Answer: Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth.
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If a focal length of a lens is -20 cm. Find the nature and the power of lens. If that lens is combined with another lens of power -5D. Find the combined power of these two lenses. bebbenn
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