An element exists in two allotropic forms. One form is CCP and the other form is HCP arrangement of atoms of the element. If the atomic radius of element is same in both the forms, then both allotropi

Question

An element exists in two allotropic forms. One form is CCP and the other form is HCP arrangement of atoms of the element. If the atomic radius of element is same in both the forms, then both allotropic forms have the same

Prashant Kotian · Accepted Answer

Correct answer: A,B,C,D. Both CCP and HCP represent closest-packed structures with a coordination number of 12 and packing efficiency of 74% (meaning unoccupied space is 26%). Since they have the same packing efficiency and atomic radius, they share the same density and the distance between consecutive layers, which is 2r * sqrt(2/3).

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