Plutonium exist in extremely low concentrations in uranium minerals; the chemical form is probably plutonium dioxide or a complex oxide with uranium.
Platinum usually exists uncombined in nature or alloyed with iridium.
Hydrogen is found both free and chemically combined in nature. It is the most abundant element in the universe and is typically found combined with other elements such as oxygen in water or carbon in hydrocarbons. However, pure hydrogen gas can also be found in certain environments, such as in the atmospheres of gas giants like Jupiter and Saturn.
Both.
An insignificant amount of plutonium exists in nature. Mostly, plutonium is obtained from nuclear reactions caused by humans.
Natural isotopes of plutonium exist only in traces in uranium ores.
No, different compounds found together but not chemically combined do not make up an element. An element is defined as a pure substance that consists of only one type of atom, characterized by its atomic number. Compounds are formed from two or more elements that are chemically bonded together. Therefore, a mixture of compounds does not change the fundamental nature of the individual elements present.
its an element, so yes, any thing that's not manufactured by man is natural, therefore found in nature. It is not, however, found unless forced by man; so for most practical purposes it is not found in nature.
Different compounds found together but not combined chemically make up a mixture. In a mixture, the substances retain their individual properties and can be separated using physical methods. A compound is formed when elements are chemically combined in a fixed ratio.
Plutonium can be found in a variety of different locations. Trace elements can be found everywhere in nature. They tend to be found in concentrated form near uranium ores, e.g. the Cigar Lake mine in Canada.
Plutonium can be found accompanying uranium minerals but only in insignificant traces. Plutonium is obtained as an industrial product in nuclear reactors. A low pollution from nuclear facilities or nuclear weapons tests exist in the environment now. The chemical form is probably plutonium dioxide.
combined form
Zinc is usually combined with other elements.