Can someone please help me?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

C3h8o3 - glycerol major species present when dissolved in water

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this