What group on the periodic table is more reactive 5 or 6 and why?

2. how is heavy water different from normal water

Which best describes how johannes kepler developed his laws of planetary motion

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?