Question

what is hydrogen ?



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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.

Answer 2

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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.

• Symbol: H
• Atomic mass: 1.00784 u
• Atomic number: 1
• Electron configuration: 1s1
• Discoverer: Henry Cavendish
• Isotopes: Deuterium, Tritium