Atomic and nuclear properties of oganesson (Og)

Recognized by IUPAC on December 2015, tentative name as of June 2016.
Status of heaviest elements as of June 2016 (pdf)
QuantityValueUnits ValueUnits
Atomic number 118     
Atomic mass [294.214(8)] g mole-1   
Specific gravity (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 collision length 126.0 g cm-2 1.050E+04 cm
Nuclear interaction length 224.3 g cm-2 1.870E+04 cm
Pion collision length 148.5 g cm-2 1.237E+04 cm
Pion interaction length 250.1 g cm-2 2.084E+04 cm
Radiation length 4.88 g cm-2 406.9 cm
Critical energy 5.67 MeV (for e-) 5.45 MeV (for e+)
Molière radius 18.26 g cm-2 1521. cm
Plasma energy ωp 2.00 eV   
Muon critical energy 131. GeV   
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: Atomic mass is that reported by the researchers as of Aug 2015.
Note: Density is that of an ideal monatomic gas.
Note: Ieff = 1242 eV assumed in calculating critical energies and dE/dx.