Hydrogen

usgb/ˈhaɪdrədʒən/
noun

It is the simplest and lightest chemical element with the symbol H.

Water is made up of hydrogen and oxygen.
Visual representation of "hydrogen" - It is the simplest and lightest chemical element with the symbol H.

Often appears as...

  • hydrogen atoms
  • hydrogen molecules

Usage tips

Academic

Definition 1 of 2
Visual representation of "hydrogen"
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Science Classes

Hydrogen is often discussed in chemistry and physics as part of the periodic table of elements.

Illustration for Science Classes
In our chemistry class, we learned that hydrogen is the first element on the periodic table.
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Cosmic Abundance

Hydrogen is the most abundant element in the universe, relevant in space-related contexts.

Illustration for Cosmic Abundance
Astronomers estimate that hydrogen makes up about 75% of the universe's elemental mass.
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Common Compound

Hydrogen is part of many everyday compounds, such as water and organic substances.

Illustration for Common Compound
Every molecule of water has two hydrogen atoms bonded to an oxygen atom.
Visual representation of the word "Hydrogen"

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