Electron drift mobility in indium (In) has been measured to be 6 cm2 /Vs. Based on the resistivity value, determine how many free electrons are donated by each In atom in the crystal? (The room temperature (27 °C) resistivity of In is 8.37 × 10-8 Ω.m, and its atomic mass and density are 114.82 g/mol and 7.31 g/cm3

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