Answer
(a) Element; liquid
(b) Mixture of elements; gases
Work Step by Step
(a) The liquid state of an element is depicted in this diagram. Because it is made up of spheres of a single color, we can be certain that it is an element that is depicted. Because the spheres are arranged in a row, the atoms can move around, indicating that it is a liquid, but the arrangement is still somewhat stiff.
(b) The two distinct colored spheres in this diagram stand in for the two different elements. The fact that they are arranged in pairs indicates that the elements are diatomic. The two substances are in a combination in the gaseous state because they are freely floating around.
