The reaction between sodium and chlorine that forms table salt is shown. Na (8) + Cl2 (9) → _NaCl(s)
What coefficient should be added to the blanks to balance the equation?

An observation that requires measurement is called quantitative observable or qualitative

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?

Which element would mostly likely have an electron affinity measuring closest to zero