Yes, lead is a naturally occurring element. You can find it on the Periodic Table of Elements.
Yes
Thallium, discovered in 1861, does occur naturally, but not in its pure form.
Not naturally on Earth; calcium is too reactive with oxygen and water vapor to remain in a pure form outside a container.
Elements are examples of pure substances. Lead is an element, which means lead is pure.
Reverse Osmosis does not occur naturally. It works by using pressure to force a solution through a membrane, retaining the solute on one side and allowing the pure solvent to pass to the other side.
Hydrogen exists in water and methane, Pure hydrogen as an element is very rare in earth's atmosphere. Normally hydrogen is naturally found combined with other elements. A prime example of this is in water. Hydrogen and oxygen combine to make water.
Thallium, discovered in 1861, does occur naturally, but not in its pure form.
No, it does not exist naturally in its pure form. Itexists in the combined form.
Gold is one of the few metals that occurs in its pure state in nature. Gold pieces found are called nuggets.
Germanium is a naturally occurring element, but does not occur in pure form on the Earth (only in compounds).
At 25°C, pure caffeine is a solid.
Lead is an element and is natural, but is not often found in its pure state. It is usually found in an ore that has a lead compound and a mixture of other compounds of other metals. It is then refined to produce more pure lead metal.
Barium is a natural element. However, because it is so highly reactive, it does not occur naturally in a pure form.
Capsaicin is the molecule that gives chili peppers their "heat". Thus, it is naturally found in peppers of the genus Capsicum, which includes all chili peppers. Pure capsaicin does not occur naturally.
Not naturally on Earth; calcium is too reactive with oxygen and water vapor to remain in a pure form outside a container.
Yes, in some places naturally occurring "nuggets" of copper can be found.
Some elements that are not chemically combined with any other substance exist as single atoms. Pure copper, pure lead, pure silver. Oxygen does not, the pure state of oxygen is a diatomic molecule, O2.
Elements are examples of pure substances. Lead is an element, which means lead is pure.