Describe the two processes that could make it possible for a specific rock to be found at the top of a mountain and also in smaller bits in a lake at the bottom of the mountain.

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.

What is a number added in front of a formula in order to balance the equation

In the reaction h2co3 (aq) + 3nh3 (aq) = 2 nh4+ (aq) + co3 2-, how many electrons are transferred?