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)

Quantity	Value	Units	Value	Units
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 ℏωp	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: I_eff = 1242 eV assumed in calculating critical energies and dE/dx.
Table of isotopes via WIKIPEDIA