Hydrogen
Hydrogen
Chemical element with atomic number 1 (H).
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Readers' pathsAug 2026 – Oct 2026
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Helium
Chemical element with atomic number 2 (He).
10%
Isotopes of hydrogen
3.6%
Chemical element
Chemical substance not composed of simpler ones.
3.1%
Water
Chemical compound of hydrogen and oxygen.
2.8%
Periodic table
Tabular arrangement of the chemical elements.
2.8%
Plasma (physics)
State of matter.
2.7%
Atomic number
Number of protons found in the nucleus of an atom.
2.3%
Deuterium
Isotope of hydrogen with one neutron.
2.1%
Henry Cavendish
English natural philosopher, and scientist (1731–1810).
2.1%
Lithium
Chemical element with atomic number 3 (Li).
2%
Readers come from
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Periodic table
Tabular arrangement of the chemical elements.
11%
Helium
Chemical element with atomic number 2 (He).
6.4%
Deuterium
Isotope of hydrogen with one neutron.
3.5%
Oxygen
Chemical element with atomic number 8 (O).
2.9%
1993 World Trade Center bombing
Terrorist attack in the United States.
2.2%
Sun
Star at the centre of the Solar System.
2%
Isotopes of hydrogen
1.7%
Water
Chemical compound of hydrogen and oxygen.
1.5%
Carbon
Chemical element with atomic number 6 (C).
1.4%
Hindenburg disaster
1937 airship fire in the US.
1.2%