Consider a neutral atom with 108 protons and 112 neutrons. The atomic number of the element is...? A
112
B
108
c
C
220
D
cannot be determined

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?