In a chemical formula or a chemical equation, what is the small number after the element symbol?

What happens when light is scattered?

How do i turn 2 s into one in the products

According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another? the volume and the shape stay the same. the volume increases to fill the new container, but the shape stays the same. the volume stays the same, but the shape changes to fit the new container. the volume and the shape change to fill the new container.