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its hydrogen...it exist in 3 isotopic form...protium,deuterium nd tritium.
Its not said isotropic form. In three states?
but still hydrogen is an element!
its not isotropic,its isotopic...!..having same atomic no. but different mass no.



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Water exist in all three states i.e., solids, liquids & gas.
Solid- Ice
Liquid- Water
Gas- Steam.
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It is water which exists in all the three states....
they are- solid-ice
              gas-water vapour
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