NEET 2009 Chemistry question
Not in JEE Main or NEET syllabus
Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell of lithium is 351 pm, the atomic radius of the lithium will be:
Answer: (1)
Solution
In a body-centred cubic (bcc) unit cell the atoms touch along the body diagonal, whose length is . So \dfrac{\sqrt{3}}{4}\dfrac{1.732 × 351}{4}$\ pm = 151.99 ≈ 151.8\
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