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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:
These isotopes differ in the atomic number.

1 5 1
Hydrogen is a , odourless,colourless, the chemical element of atomic number 1 ,highly flammable gas.
0 0 0
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