Atoms of the main group elements either gain or lose electrons so they have eight electrons in the outermost energy level. In doing so, they attain a noble gas electron configuration. Match these elements with the number of electrons they gain or lose.

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?

Energy defines the different "states" of matter. in no more than 3 sentences, describe the amount of kinetic energy that each of the 3 states of matter possesses and relate that to the atom/molecular motion of each "state".

How many grams of phosphorus are contained in 5.09 moles of phosphorus?