Which of the following is not a polymer? plastic alcohol teflontm polyester

What happens to isotopes that are unstable?

Ineed to find the answer of this question because i dont understand it

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