An atom is ionized so that it has only one electron. When the electron drops from the n = 5 shell to the n = 1 shell, an X-ray of wavelength 121.14 pm is emitted. What is the atomic number?

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

What are transitions between a liquid and a solid called? identify which way they are transitioning

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?