Which of the following would form a nonelectrolyte

Define dew point. i am writing this part to be able to ask the question

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

How many grams of mgbr2 are needed to produce 75g or metal?