are substances transparent due to arrangement or due to their nature?why are other substances opaque?

Question

can a molecule of a substance be classified as trasparent or opaque?

Answer 1

Arrangement. All objects are only arrangement

Answer 2

it's both. some substances absorbs, reflect, or scatters light more than others. morphology is also vital. a substance is opaque typically has a random arrangement so that it was a high probability that a molecule will block the path of light being transmitted. molecules also absorbs energy so at certain frequency, the substance may appear opaque; for example, a object appears red because it reflects red light, but the substance may be transparent for other colors.

Answer 3

All "substances" like air, water, wood, metal, polyurethane, fabric, etc. have associated with them a few electromagnetic constants, such as characteristic impedance, magnetic permeability, and electrical permitivity. There are equations that involve these constants as well as the frequency of light in question that will give 3 quantities: the absorbtion constant, transmission constant, and reflection constant. These constants are the fraction of electromagnetic energy that is absorbed, transmitted, and reflected by the material. So, for example, a piece of coal will have a high absorbtion constant (at visible frequencies), glass and air have high transmission constants, and silver has a high reflection constant. Now, once these constants have been established, one then has to look at the big picture: silver may have a high reflection constant, but if there is a low-transmission-constant substance on it (like dirt), less light makes it to the silver to be reflected.

Answer 4

transparent or opaque relates to light coming out or not.
depends on arrangement of molecules.

Answer 5

Yes. it is due to loose arrangement of atoms. A densely packed matter cannot let light ( photon ) pass through it.