Will do brainliest its science

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge

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?

Can someone me with 6 to 10 plz this is for masteries test.