Atomic and nuclear properties of copernicium (Cn)

Element 112 recognized by IUPAC May 2009, name recognized February 2010
Status of heaviest elements as of May 2014 (pdf)

Quantity	Value	Units
Atomic number	112
Atomic mass	[285.174(5)]	g mole-1
Specific gravity	??	g cm-3
Mean excitation energy	1156.0	eV
Minimum ionization	1.080	MeV g-1cm2
Nuclear collision length	124.9	g cm-2
Nuclear interaction length	222.0	g cm-2
Pion collision length	147.4	g cm-2
Pion interaction length	247.8	g cm-2
Radiation length	5.16	g cm-2
Critical energy	5.84	MeV (for e-)
Molière radius	18.75	g cm-2
Plasma energy ℏωp	67.57	eV
Muon critical energy	110.	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: Since there are no stable isotopes, [atomic mass] is that of the longest-lived isotope known as of Jan 2007.
Note: Density 14.0 g/cm³ and I_eff = Z*10.0 eV assumed in calculating critical energies and dE/dx.
Table of isotopes Warning: may not be current