Aluminium crystallizes in a cubic close packed structure. Radius of the metal is 125 pm. i) What is the length of the side of the unit cell? ii) How many unit cells are there in 1 cm3 of aluminium?
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in CCP structure
i) a=2r = 250pm
volume of 1 unit cell
= 1953125× pm³
= 1.953125×10-²⁴ cm³
so in 1cm³
= 10²⁴÷1.953125 unit cells
= 5.12×10²³
i) a=2r = 250pm
volume of 1 unit cell
= 1953125× pm³
= 1.953125×10-²⁴ cm³
so in 1cm³
= 10²⁴÷1.953125 unit cells
= 5.12×10²³
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