Calculate the moles of H2 that are needed to form 4.3 moles of NH3

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

Draw metallic bonding if two copper