86 - Radon noble gas
Discovered by Friedrich Ernst Dorn in 1900
Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as a decay product of radium. Its most stable isotope, 222Rn, has a half-life of 3.8 days.
Periodic table
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 18 | 2 in 3s + 6 in 3p + 10 in 3d |
| 4 | 32 | 2 in 4s + 6 in 4p + 10 in 4d + 14 in 4f |
| 5 | 18 | 2 in 5s + 6 in 5p + 10 in 5d |
| 6 | 8 | 2 in 6s + 6 in 6p |
Electron shells
colorless gas, occasionally glows green or red in discharge tubes Appearance
222 u Atomic Mass
211 K Boiling Point
18 Group
1.5 Å Covalent Radius
0.00973 g/cm³ Density
−68 kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 Electron Configuration
[Xe] 4f14 5d10 6s2 6p6 Electron Configuration (semantic)
86 Electrons
10.7 eV First Ionization Energy
1037 kJ/mol Ionization Energies
202 K Melting Point
6 Mendeleev Number
6 Number of Shells
8 Electron Valency
136 Neutrons
86 Atomic Number
20 Number of Isotopes
6 Period
Gas Phase
86 Protons
2, 8, 18, 32, 18, 8 Electron Shell Occupations
0.094 J/(g K) Specific Heat