How many neutrons does the element Platinum (Pt) have?

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?

Amixture with the same composition throughout is!

What state of matter is ice a. liquid b. element c. solid d. gas