Question

what is hydrogen?????????????.​

Answer 1

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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. Non-remnant stars are mainly composed of hydrogen in the plasma state. The most common isotope of hydrogen, termed protium (name rarely used, symbol 1H), has one proton and no neutrons.

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Answer 2

Answer:

a colourless, odourless, highly flammable gas, the chemical element of atomic number 1.

Explanation:

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