the half life of polonium 210 210po is 138 days sample amount has a mass of 170 mg the element decays according to the following equation ln 2t at 170e 138 find the mass of the sample after 99809

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SOLVED:Polonium (Po) is the largest member of group 16 and is the only element known to take on the simple cubic crystal system. The distance between nearest neighbor Po atoms in this structure is 335 pm. (a) What is the diameter of a Po atom? (b) What is the density of Po metal? (c) At what angle (in degrees) to the parallel faces of the Po unit cells would first-order diffraction be observed when using X-rays of wavelength 1.785 ×10^-10 m ?

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