21. Which of the following statements is true about ions? a. Cations form when an atom gains electrons
b. Cations form when an atom loses electrons
C. Anions form when an atom gains protons
d. Anions form when an atom loses protons

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 states of matter have particles that move independently of one another with very little attraction?

Which of these are physical changes in matter? check all that apply boiling water a pencil being sharpened exploding dynamite freezing water rotting cheese