What information does an equilibrium constant give about a reaction?

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).