Uranium-238 decays spontaneously to produce helium and thorium-234. Why is uranium considered an element rather than a chemical compound of helium and

thorium?

How many valence electrons are in atom of radon?

Which subshell is represented by the actinides family?

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices