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8 March, 07:56

Which is an element? ... air ... carbon dioxide ... hydrogen ... water Description

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  1. 8 March, 08:34
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    All Elements are obtained in the periodic table & water is Not an element it is a compound.
  2. 8 March, 10:06
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    The answer is Hydrogen.

    Hydrogen can be found in the periodic table. There other choices are not element but compounds, which is a molecule made of more than ONE element.

    Air is a mixture of gas molecules

    Carbon dioxide is CO2

    Water is H2O

    So as you can see, they se al made of different elements
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