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Mass number 222
Atomic radius, non-bonded
Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced. These values were determined using several different methods.
Half of the distance between two atoms within a single covalent bond. Values are given for typical oxidation number and coordination.
The energy released when an electron is added to the neutral atom and a negative ion is formed.
Electronegativity (Pauling scale)
The tendency of an atom to attract electrons towards itself, expressed on a relative scale.
First ionisation energy
The minimum energy required to remove an electron from a neutral atom in its ground state.
Common oxidation states
The oxidation state of an atom is a measure of the degree of oxidation of an atom. It is defined as being the charge that an atom would have if all bonds were ionic. Uncombined elements have an oxidation state of 0. The sum of the oxidation states within a compound or ion must equal the overall charge.
Atoms of the same element with different numbers of neutrons.
Key for isotopes
|Mode of decay|
|α||alpha particle emission|
|β||negative beta (electron) emission|
|EC||orbital electron capture|
|ββ||double beta emission|
|ECEC||double orbital electron capture|
Oxidation states and isotopes
Oxidation states and isotopes
|Common oxidation states||2|
|Isotopes||Isotope||Atomic mass||Natural abundance (%)||Half life||Mode of decay|
|211 Rn||210.991||–||14.6 h||β+,EC|
|220 Rn||220.011||–||55.6 s||α|
|222 Rn||222.018||–||3.823 d||α|
Data for this section been provided by the British Geological Survey .
Relative supply risk
An integrated supply risk index from 1 (very low risk) to 10 (very high risk). This is calculated by combining the scores for crustal abundance, reserve distribution, production concentration, substitutability, recycling rate and political stability scores.
Crustal abundance (ppm)
The number of atoms of the element per 1 million atoms of the Earth’s crust.
The percentage of a commodity which is recycled. A higher recycling rate may reduce risk to supply.
The availability of suitable substitutes for a given commodity.
High = substitution not possible or very difficult.
Medium = substitution is possible but there may be an economic and/or performance impact
Low = substitution is possible with little or no economic and/or performance impact
The percentage of an element produced in the top producing country. The higher the value, the larger risk there is to supply.
The percentage of the world reserves located in the country with the largest reserves. The higher the value, the larger risk there is to supply.
Political stability of top producer
A percentile rank for the political stability of the top producing country, derived from World Bank governance indicators.
Political stability of top reserve holder
A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators.
Specific heat capacity (J kg −1 K −1 )
Specific heat capacity is the amount of energy needed to change the temperature of a kilogram of a substance by 1 K.
A measure of the stiffness of a substance. It provides a measure of how difficult it is to extend a material, with a value given by the ratio of tensile strength to tensile strain.
A measure of how difficult it is to deform a material. It is given by the ratio of the shear stress to the shear strain.
A measure of how difficult it is to compress a substance. It is given by the ratio of the pressure on a body to the fractional decrease in volume.
A measure of the propensity of a substance to evaporate. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system.
Pressure and temperature data – advanced
Pressure and temperature data – advanced
Chemistry in its element: radon
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Element Radon (Rn), Group 18, Atomic Number 86, p-block, Mass . Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.