Are magnesium and calcium more reactive with oxygen in the air than aluminum?

Compare and contrast the bohr model and the electron cloud models of the atom.

All of the following are part of the biosphere except

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?