What kind of oxide is formed when a piece of sodium is dropped in the water

What will most likely happen when two bromine atoms bond together?

Ineed ! i have no clue how to do this problem.

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.