I want in chemistry exercises for lesson structure of the atom

Which statement about the stamps is correct?

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.

Nuclear decay is the spontaneous decay of one element into a. an x-ray b. a ray of light c. another element