Bright Atoms, home
Periodic table / Noble gases

86Radon

Radon is a noble gase in group 18, period 6. At 25 °C it is a gas.

Rn
Shells: 2, 8, 18, 32, 18, 8. A simple picture: electrons do not move in circles.
Symbol
Rn
Atomic number
86 protons in the nucleus
Standard atomic weight
None. Radon has no stable isotopes, so the mass of a sample depends on which isotopes it holds.
Electron configuration
[Xe] 4f14 5d10 6s2 6p6
Electrons in each shell
2, 8, 18, 32, 18, 8
Group, period, block
18, 6, p
Family
Noble gases
State at 25 °C
gas
Electronegativity
no value
First ionisation energy
1037.1 kJ/mol (10.7485 eV)
Where these numbers come from

Atomic weight: IUPAC CIAAW, abridged standard atomic weights 2024. Electron configuration and ionisation energy: NIST Atomic Spectra Database. Family, state and electronegativity: PubChem. See Sources. Melting points, boiling points and densities are left out for now: published values differ between sources, and we will add them once each has been checked.