Which of the following have the highest packing efficiency?
I.Simple cubic
II.Body-centered cubic
III.Face-centered cubic
IV.Hexagonal closest packed

Question

Which of the following have the highest packing efficiency? 
I.Simple cubic
II.Body-centered cubic
III.Face-centered cubic
IV.Hexagonal closest packed

Quizplus · Accepted Answer

Face-centered cubic (FCC) and Hexagonal closest packed (HCP) have the highest packing efficiency. Both structures have a packing efficiency of 74%. FCC has the highest packing efficiency among all cubic structures, and it is the most common crystal structure for metals like aluminum, copper, gold, nickel, and silver. HCP is the most efficient way of packing spheres in a closed-packed structure, and it is the crystal structure of metals like magnesium, titanium, and zinc. Simple cubic has a packing efficiency of only 52%, and body-centered cubic has a packing efficiency of 68%.

Which of the Following Have the Highest Packing Efficiency