Please help ! I will give you more points and rate you the !

What are the first three quantum numbers for the electrons located in subshell 2s?

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?

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?