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.
Read key information and facts about element Radon
|Group in Periodic Table||18|
|Group Name||helium family or neon family|
|Period in Periodic Table||6|
|Block in Periodic Table||p-block|
|Electronic Configuration||[Xe] 4f14 5d10 6s2 6p6|
|Melting Point||-71 °C|
|Boiling Point||-61.7 °C|
|Electronic Shell Structure||[2, 8, 18, 32, 18, 8]|
Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of electrons. The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Therefore you can directly look for atomic number 86 to find Radon on periodic table.
Another way to read periodic table and locate an element is by using group number (column) and period number (row). To locate Radon on periodic table look for cross section of group 18 and period 6 in the modern periodic table.
The element Radon was discovered by Friedrich Ernst Dorn in year 1900 in Germany . Radon derived its name From radium, as it was first detected as an emission from radium during radioactive decay
The table below shows the abundance of Radon in Universe, Sun, Meteorites, Earth's Crust, Oceans and Human Body.
|Ppb by weight (1ppb =10^-7 %)|
|Abundance in Universe||N/A|
|Abundance in Sun||N/A|
|Abundance in Meteorites||N/A|
|Abundance in Earth's Crust||N/A|
|Abundance in Oceans||6×10-20%|
|Abundance in Humans||N/A|
The solid state structure of Radon is Face Centered Cubic.
The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in three dimensional space to form the structure.
The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c)
and the angles between them Lattice Angles (alpha, beta and gamma).
The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point.
The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct.
|Space Group Name||N/A|
|Space Group Number||N/A|
|Crystal Structure||Face Centered Cubic|
Radon atoms have 86 electrons and the electronic shell structure is [2, 8, 18, 32, 18, 8] with Atomic Term Symbol (Quantum Numbers) 1S0.
|Number of Electrons (with no charge)||86|
|Number of Protons||86|
|Number of Neutrons||136|
|Shell structure (Electrons per energy level)||[2, 8, 18, 32, 18, 8]|
|Electron Configuration||[Xe] 4f14 5d10 6s2 6p6|
|Valence Electrons||6s2 6p6|
|Atomic Term Symbol (Quantum Numbers)||1S0|
Shell Structure of Radon - Electrons per energy level
The ground state electronic configuration of Neutral Radon atom is [Xe] 4f14 5d10 6s2 6p6. The portion of Radon configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Xe]. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used.This is important as it is the Valence electrons 4f14 5d10 6s2 6p6, electrons in the outermost shell that determine the chemical properties of the element.
Complete ground state electronic configuration for the Radon atom, Unabbreviated electronic configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6
Radon atomic radius is 120 pm, while it's covalent radius is 145 pm.
120 pm (1.2 Å)
|Atomic Volume||22.816032888 cm3|
|Covalent Radius||145 pm (1.45 Å)|
|Van der Waals Radius||N/A|
|Neutron Cross Section||0.7 σa/barns|
The electron affinity of Radon is 0 kJ/mol
Refer to table below for Ionization energies of Radon
|Ionization energy number||Enthalpy - kJ/mol|
Refer to below table for Radon Physical Properties
|Molar Volume||22.816032888 cm3|
Radon is N/A of electricity. Refer to table below for the Electrical properties of Radon
|Thermal Conductivity||0.00361 W/(m K)|
|Mass Magnetic Susceptibility||N/A|
|Molar Magnetic Susceptibility||N/A|
|Volume Magnetic Susceptibility||N/A|
|Speed of Sound||N/A|
Refer to table below for Thermal properties of Radon
|Melting Point||202 K (-71 °C)|
|Boiling Point||211.3 K (-61.7 °C)|
|Critical Temperature||377 K|
|Heat of Fusion||3 kJ/mol|
|Heat of Vaporization||17 kJ/mol|
|Heat of Combustion||N/A|
Isotopes of rhodium. Naturally occurring Radon has 1 stable isotope - None.
|Isotope||Isotope Mass||% Abundance||T half||Decay Mode|
|DOT Hazard Class||7|
|NFPA Fire Rating||N/A|
|NFPA Health Rating||N/A|
|NFPA Reactivity Rating||N/A|
List of unique identifiers to search the element in various chemical registry databases
|CAS Number - Chemical Abstracts Service (CAS)||CAS10043-92-2|
|Alkali Metals||Alkaline Earth Metals|
|Transition Metals||Post-Transition Metals|