Which of the following is not a crystal system?

Solids are classified as _______

If a crystal lattice has 6 closed-pack spheres, what the number of tetrahedral voids in the lattice?

What is the coordination number for one-dimensional close packing?

The unit cell with a≠b≠c and α=β=γ=90 refers to ______ crystal system.

The molecules in polar molecular solid are held together by ______

What is the coordination number for a two-dimensional square close packed structure?

If the aluminum unit cell exhibits face-centered behavior then how many unit cells are present in 54g of aluminum?