Opposite - Heavy / light

Ask your child to put a stone on one side of the weighing scale and a leaf on the other side. They will see that the side with the stone goes down, as it is heavy, and the side with the leaf goes up, as it is light in weight. Ask your child to experiment and see what other things are light and heavy.
According to this, objects can be classified as heavy or light based on their weight. The objects with the most weight are heavy, while the objects with the least weight are light. For example, an iron ball, is heavy, whereas a football is a light (even if it is looking a bit bigger than the iron ball).
Use the idea that light travels in straight lines to explain that objects are seen because they give out or reflect light into the eye. Explain that we see things because light travels from light sources to our eyes or from light sources to objects and then to our eyes.
Light metals are metals that have low densities, low atomic mass, and low atomic weight. They are lightweight. Examples include: aluminum, magnesium, and titanium. Heavy metals, however, are metals that have high densities, high atomic mass, and high atomic weight compared to other metals.