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2015-01-31T17:33:15+05:30

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Hydrogen is a element that has atomic number 1.
It is found abundant in earth about 75 percent.
It is the lightest element among the periodic table.
It contains three isotopes:
Protium,Deutrium,Tritium
These isotopes differ in the atomic number.

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2015-01-31T17:49:44+05:30
Hydrogen is a , odourless,colourless, the chemical element of atomic number 1 ,highly flammable gas.
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