Nickel has five naturally occurring isotopes. Nickel-57.93 (68.08%, Nickel-59.93 (26.22%), Nickel-60.93 (1.14%), Nickel-61.93 (3.63%), and Nickel-63.93 (0.93%).
Calculate the average atomic mass.
HELPPP

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?