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CG PET BCC Geometry — practice questions

Explore 1 free BCC Geometry questions in CG PET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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BCC Geometry questions and exercises with answers

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The relationship between **edge length $a$** and **atomic radius $r$** in a **body-centred cubic (bcc)** unit cell is:Read the answer and worked solution →

Worked practice questions

The relationship between **edge length $a$** and **atomic radius $r$** in a **body-centred cubic (bcc)** unit cell is:

  1. $a = 2r$
  2. $a = 4r/\sqrt 3$
  3. $a = 4r/\sqrt 2$
  4. $a = r\sqrt 3$
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Correct answer: B. $a = 4r/\sqrt 3$

In bcc, body diagonal $= a\sqrt 3 = 4r$ (along it: corner atom + central atom + corner atom = 4r in radii). **So $a = 4r/\sqrt 3$.**

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