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

All Ferroelectrics are pyroelectrics.

The total number of atoms in one unit cell of primitive unit cubic cell is __ atom(s).

Polar molecular solids are _____

Silicon is found in nature in the forms of ____

Which of the following unit cells has constituent particles occupying the corner positions only?

Which of the following is an orderly collection of positive ions surrounded and held together by a sea of electrons?

Which among the following compounds is Antiferroelectric?