Question

what is hydrogen ????​

Answer 1

Answer:

hydrogen is a gas.

hydrogen forms water-H2O

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Answer 2

Answer:

hydrogen is a element present in water, air

Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.

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