The elements in Group 1 have similar chemical properties. Descnbe one chemical reaction which shows that lithium, sodium and potassium (using a group 7 element)
react in the same sort of way.
You should say what you would react them with and what substances would be
produced.​

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?