The length of the side of a unit cell for lithium is 351 pm, calculate its atomic radius. Lithium forms a body-centred cubic crystal.
A
303.9 pm
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B
124.09 pm
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C
151.9 pm
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D
202.6 pm
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Solution
The correct option is C 151.9 pm From the figure, edge length AB=a, BC, face diagonal, BC=√2a Body diagonal, (AC)=√(√2a)2+a2=√3a ⇒4r=√3a ⇒r=√34a ⇒r=√34×351=151.9pm