Molecular compounds are usually exceptions to the law of definite proportions composed of two or more transition elements composed of two or more nonmetallic elements composed of positive and negative ions

The answer is composed of two or more non-metallic elements. Molecular compounds hold two or more nonmetals. Typically you can identify you are dealing with a molecular compound for the reason that the first element in the compound name is a nonmetal. 

Naming and Writing Formulas for Molecular Compounds Quiz

A

B

A

C

C

D

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.