Consider the following statements about crystalline solids: 1) Molecules or atoms in molecular solids are held together via ionic bonds. 2) Metallic solids have atoms in the points of the crystal lattice. 3) Ionic solids have formula units in the point of the crystal lattice. 4) Molecules in covalent-network solids are connected via a network of covalent bonds. Which of the statements is true? A) 1. B) 2. C) 3. D) 4.E) None.

Molecules in covalent-network solids are connected via a network of covalent bonds.

Explanation:

A covalent network solid is a kind of solid consisting of the same type of molecules linked together by covalent bonds to form a three dimensional crystal lattice. Examples of a covalent crystal solid include; graphite and diamond. The entire lattice consists of covalent bonds. These molecules are closely packed in unit cells held together by vanderwaals forces.