Which Greek element signifies 'green' often associated with chemistry?

The element that signifies 'green' and is often associated with chemistry is "chloro." This term is derived from the Greek word "chloros," which means green. In chemistry, "chloro" is a prefix used to denote compounds that contain chlorine, especially those that impart a greenish color, such as chlorophyll in plants. Chlorophyll is crucial for photosynthesis and is green due to its ability to absorb light in the blue and red wavelengths, reflecting green light.

The other choices represent different prefixes but do not imply the color green. "Hydro" is related to water (from hydrogen), "photo" refers to light, and "bromo" pertains to bromine, which does not connote any color association with green.