Which of the Which of the following is NOT a type of crystal structure? A. Ionic B. Metallic C. None of these D. Macromolecular (giant covalent)e following is NOT a type of crystal structure?

None of these

Explanation:

A crystal structure refers to a regular, unique pattern if atom arrangement that characterizes a particular solid material. A crystal structure comprises of a unit cell, the unit cell refers to a regular arrangement of atoms in a particular pattern; this pattern is periodically repeated in the three dimensional structure of the lattice.

Many substances in nature such as minerals, metals, covalent network solid macromolecules and ionic substances are arranged in crystal structures. All the substance categories listen among the options possess definite crystal structures arranged in unit cells. None of them is a noncrystalline substance, hence the answer above.