25
35
55
75
The packing efficiency is 25 %.
The percentage of total space in a unit cell that is filled by the constituent particles, such as atoms, ions, or molecules, packed within the lattice is called the packing efficiency. It is the total amount of space engaged by these particles in three-dimensional space. In a simple manner, we can understand it as the specified percentage of the total volume of a solid which is occupied by spherical atoms. Packing Efficiency can be evaluated in three structures with the help of geometry which are: