How many molecules are in 7.34 g of Na2CO3

What is the mass of 8 moles of sodium atoms

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

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.