Radon Rn (Element 86) of Periodic Table

86 Rn (Radon)

Appearance:  Colorless gas, Occasionally glows green or red in discharge tubes

Mass number:  222

Atomic weight:  222.0176 g/mol

Atomic number (Z):  86

Electrons:  86

Protons:  86

Neutrons:  136

Group:  18

Period:  6

Block:  P

Element category:  Noble gas

Electrons per shell:  K2, L8, M18, N32, O18, P8

Electron configuration:  1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p6

Phase:  Gas

Melting point:  202 K (-71 oC)

Boiling point:  211.5 K (-61 oC)

Density:  9.73 kg/m3 (in Gas), 4.4 g/cm3 (In Liquid at B.P)

Molar volume:  0.0228 m3/mol

Thermal conductivity:  0.00361 W/m*K)

Valence:  6

Electron affinity:  0 kJ/mol

Half Life(s):  330350

Lifetime(s):  476590

Decay mode:   α decay

Neutron cross section (Barns):  0.7

Critical point:  377 K, 6.28 MPa

Heat of Fusion: 3.247 kJ/mol

Heat of vaporization:  18.10 kJ/mol

Molar heat capacity:  5R/2 = 20.786 J/(mol∙K)

Oxidation states:  2, 2, 0

Electronegativity: 2.2

Ionization energies:  1st: 1037 kJ/mol

Atomic radius:  120 pm

Covalent radius:  150 pm

Vander waals radius:  220 pm

Crystal structure:  Face-centered cubic

Thermal conductivity:  3.61×10-3 W/(m∙K)

Magnetic ordering:  non-magnetic

CAS Number:  10043-92-2

Discovery:  Ernest Rutherford and Robert B. Owens (1899)

First isolation: William Ramsay and Robert Whytlaw-Gray (1910)

Isotopes:  210Rn 211Rn 222Rn  224Rn

Uses:  useful in cancer therapy, treat tumours etc.. use in Home testing kits

Natural Abundance:  Radon is produced naturally from the decay of the isotope radium-226, which is found in rocks


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