Chemistry

Chemistry

Problem

The atomic radius of magnesium is 160 pm, whereas aluminum has an atomic radius of 143 pm. Calculate the percent difference in atomic radii (defined as ∣rlarge−rsmall∣rlarge×100%\frac{|r_{\text{large}}-r_{\text{small}}|}{r_{\text{large}}}\times100\%) and determine the alloy type most likely formed when the two metals are mixed. a) 18 %18\,\% difference; substitutional alloy expected b) 11 %11\,\% difference; interstitial alloy expected c) 11 %11\,\% difference; substitutional alloy expected d) 12 %12\,\% difference; substitutional alloy expected

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