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Rohit Keshri Grade:
        

Chromium metal crytallises with a b.c.c lattice . The length of unit cell edge is 287pm . What is the atomic radius? 

6 years ago

Answers : (1)

Sona Srivastava
38 Points
										

imagine the main body diagonal of the cube -
there will b 3 atoms with their centres on the body diagonal


one atom(at centre) completely lies in the cube (contributing =2*r) and other 2 lie half inside the cube(contributing r each)


so


4*r = a√3 = length of body diagonal


4*r = 287√3 pm


r = (287√3)/4 pm


r = 124.27 pm

6 years ago
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