Which pair of elements is most likely to form an ionic bond?

a: hydrogen and helium
b: lithium and potassium
c: potassium and iodine
d: iron and zinc

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.

catya that's not even a b or c