86 2 · 8 · 18 · 32 · 18 · 8

Radon, Rn, element 86

Noble gas· Period 6· Group 18· p-block

Configuration [Xe]4f¹⁴5d¹⁰6s²6p⁶

Atomic weight: 222Da
Phase: gas
Density: 0.009074g/cm³
Melting point: 202.15K -71 °C
Boiling point: 211.45K -61.7 °C
Electronegativity: 2.2

Colorless radioactive gaseous element, belongs to the noble gases. Of the twenty known isotopes, the most stable is Rn-222 with a half-life of 3.8 days. Formed by the radioactive decay of Radium-226. Radon itself decays into Polonium. Used in radiotherapy. As a noble gas, it is effectively inert, though radon fluoride has been synthesized. First isolated in 1908 by Ramsey and Gray. Description from mendeleev.

Back to the table

The outermost shell: the valence electronsThe inner shellsThe nucleus One bead for each electron, on the ring of its shell, counted from the nucleus out. The rings turn at their own pace; the model is Bohr's picture of the atom, which places electrons in shells but not on true orbits.

Atomic properties

4 of 5 fields have a value for radon

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.: 222Da; Source: mendeleev
Electron configuration: [Xe]4f¹⁴5d¹⁰6s²6p⁶; Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰4f¹⁴5s²5p⁶5d¹⁰6s²6p⁶; Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.: 2 · 8 · 18 · 32 · 18 · 8; Source: Worked outfrom electron configuration

No data uncertainty of the atomic weight.

Screening of each subshell

Clementi's screening constants: how much of the nucleus's charge the other electrons hide from an electron in each subshell. What is left is the effective nuclear charge it feels.

Subshell	Screening σ	Effective charge Z − σ
1s	1.6659	84.3341
2s	22.5864	63.4136
2p	4.562	81.438
3s	24.9149	61.0851
3p	23.7194	62.2806
3d	13.4027	72.5973
4s	35.85	50.15
4p	36.6988	49.3012
4d	38.0572	47.9428
4f	37.6688	48.3312
5s	52.107	33.893
5p	54.029	31.971
5d	58.647	27.353
6s	67.676	18.324
6p	69.9242	16.0758