Water found in nature is never pure. Because of it's polarity, water naturally attracts most minerals. In order to get pure water, it must be filtered many times to remove all the impurities.
Alkali metals are not found as pure elements in nature.
The alkali metals are all very recative and are not found free in nature (pure elemental form) but are always found as compounds. (minerals)
The noble gases are always found pure because they already have their full set of valence electrons. They don't need to share or transfer any of their electrons with the other molecules.
uranium
It is found in nature in its pure form (not as a compound).
Alkali metals are not found as pure elements in nature.
The alkali metals are all very recative and are not found free in nature (pure elemental form) but are always found as compounds. (minerals)
In nature, titanium is always found as a compound, not as a pure metal. Titanium is highly reactive (although less reactive alloys can be made from it).
pure element
No, it is not always pure. In nature it is considered the purest form of water, which it is. However as it falls to the ground it mixes with a large number of impurities present in the air and hence becomes impure.
Not always; tap water is clear but contains many dissolved ions.
Sodium is not found in nature as a pure element because it is very reactive.
The noble gases are always found pure because they already have their full set of valence electrons. They don't need to share or transfer any of their electrons with the other molecules.
No. Generally in form of phosphate in nature.
yes but not in it's pure form
Pure phosphorus is extracted my chemical means and can be bought, but it does not occur in nature.
uranium