Valence electron
Valence electron
Electron in the outer shell of an atom's energy levels.
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Readers' pathsAug 2026 – Oct 2026
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Electron configuration
Mode of arrangement of electrons in different shells of an atom.
18%
Electron shell
Principal energy levels in atomic physics.
14%
Covalent bond
Chemical bond by sharing of electron pairs.
8.6%
Main-group element
Chemical elements in groups 1, 2, 13–18.
5%
Octet rule
Chemical rule of thumb.
4.6%
Transition metal
Series of chemical elements.
4.3%
Periodic table
Tabular arrangement of the chemical elements.
3.7%
Atomic orbital
Function describing an electron in an atom.
3.3%
Chemical bond
Association of atoms to form chemical compounds.
3.2%
Electron
Elementary particle with negative charge.
3%
Readers come from
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Bohr model
Atomic model introduced by Niels Bohr in 1913.
13%
Uranium
Chemical element with atomic number 92 (U).
8.7%
Carbon
Chemical element with atomic number 6 (C).
6.5%
Electron configuration
Mode of arrangement of electrons in different shells of an atom.
6.4%
Electron
Elementary particle with negative charge.
5%
Octet rule
Chemical rule of thumb.
4.6%
Electron shell
Principal energy levels in atomic physics.
3.9%
Noble gas
Group of low-reactive, gaseous chemical elements.
3.8%
Block (periodic table)
Set of adjacent groups.
2.4%
Metallic bonding
Type of chemical bond in metals.
2.2%