No, this material doesn't exist.
Lead is more dense than air.
Tungsten is the dense metal in fishing sinkers. Lead alloys are common, but lead is toxic.
A kilogram of butter as it is less dense than lead.
Lead
Just fill a container with water. The aluminum is light, and less dense than the water, so it will float to the top of the container. The lead is heavy, and more dense than the water, so it will sink to the bottom of the container. You can then separate the two easily.
The simile "as heavy as lead" means something is extremely heavy or burdensome. Lead is a dense and weighty material, so when an object or situation is compared to lead, it conveys a sense of great heaviness.
Lead is heavy.
Density is related to both weight and volume, so you have to take both into account. If you have only a small amount of dense material it could still be light, and conversely if you have a lot of material that isn't dense it could still weigh a lot. For example, lead is pretty dense but if you only have a pinhead-sized dot of it, it wouldn't be heavy. Feathers aren't dense, but if you have enough to fill a railroad car their total weight would be significant.
No, lead is not buoyant. It is incredibly dense, which makes it very heavy, and not able to float.
denser material on top of less dense material
Lead is dense and heavy, so a lead fishing weight can be kept small. In the UK, lead fishing weights are banned, anglers must use a different material replacement.
A physical description of lead is that it's dense (heavy). A chemical description of lead is that it's insoluble as an ion with few exceptions.
Sulfur is nonmetallic
Nonmetallic.
Lead is more dense than water.
lead is a very dense material and can stop most radiation particles, although it is still dangerous as some gamma rays may get through.
Lead is more dense than air.