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ADNAN MUHAMMED

Grade 12,

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Aluminium crystallizes in CCP.tge radius of aluminium atom is 125pm.what is the edge length of the unit cell.what is the coordination number of a single atom in this arrangement

Aluminium crystallizes in CCP.tge radius of aluminium atom is 125pm.what is the edge length of the unit cell.what is the coordination number of a single atom in this arrangement 

Grade:12

1 Answers

Adrija Aritra
29 Points
5 years ago
ccp means cubic close packing and hence it is the 1 with max packing efficiency ie the face centred packing with rank 4 now if all the components are identical then 1st co ordination number would be the number of component  surrounding single component  at the same least distance ... for fcc if
we consider the corner component's centre ..the
component centre closest to it is at 1/root 2 times
the edge length at the face centre ....compared to
the one at the other edge at a distance equal edge
length.....so if u look closely one corner is formed by 3 faces so for each unit cell there will be 3 nearest components...corner is surrounded by 4 such unit cells...so total 4×3=12 nearest components are there...so 1st co ordination number is 12 ...edge length value is not required for this

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