Atomic and nuclear properties of oganesson (Og)

Recognized by IUPAC on December 2015, name recognized November 2016.
Status of heaviest elements as of June 2017 (pdf)
QuantityValueUnits ValueUnits
Atomic number 118     
Atomic mass [294.21392(8)] g mol-1   
Density (20° C, 1 atm) 1.200E-02 g cm-3   
Mean excitation energy 1242.0 eV   
Minimum ionization 1.092 MeV g-1cm2 1.311E-02 MeV cm-1
Nuclear interaction length 224.3 g cm-2 1.870E+04 cm
Nuclear collision length 126.0 g cm-2 1.050E+04 cm
Pion interaction length 249.8 g cm-2 2.081E+04 cm
Pion collision length 148.5 g cm-2 1.237E+04 cm
Radiation length 4.88 g cm-2 406.9 cm
Critical energy 5.67 MeV (for e-) 5.45 MeV (for e+)
Muon critical energy 131. GeV   
Molière radius 18.26 g cm-2 1521. cm
Plasma energy ωp 2.00 eV   
For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PDF TEXT
Table of muon dE/dx and Range: PDF TEXT
Explanation of some entries
Note: Density is that of an ideal monatomic gas.
Note: Ieff = 1242 eV assumed in calculating critical energies and dE/dx.
Table of isotopes via WIKIPEDIA