Now (22.08.2012) 118 chemical elements are known.
Now are known 118 chemical elements (natural or artificial) with more than 3 100 isotopes.
The chemical substances found in the atmosphere exist as gases.
Now are known 118 chemical elements.
75 dissolved chemical elements
The chemical formula tells you. As an example take CH3COONa sodium acetate. There is sodium, carbon, hydrogen and oxygen. There are thus 4 elements.
False; practically all the chemical elements have many uses.
well some of the nature elements are known as Fire, Water, Earth, and Air Another answer I think what you may mean is what elements (chemical elements - not those in the answer above) are found in an uncombined form in nature. Well, not many. Gold is one. Nitrogen gas, oxygen, all the inert gases are others
No all Hydogen and most Helium is from the near beginning. All other elements including more He are formed by stellar processes
there are loads!
The chemical formula is established after chemical analysis.
There are 2 elements found in ammonium, nitrogen and hydrogen.
Today (July 2013) 118 chemical elements are known.