Use the periodic table entry below to answer the following question. how many protons does the element cobalt (co) have? 27 32 58.93 59

What is the chemical formula of the following compound

What happens to the atomic radius when an elctron is lost

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?