Atomic and nuclear properties of meitnerium (Mt)

Quantity	Value	Units
Atomic number	109
Atomic mass	[278.1563(7)]	g mole-1
Specific gravity	??	g cm-3
Mean excitation energy	1115.0	eV
Minimum ionization	1.090	MeV g-1cm2
Nuclear collision length	124.0	g cm-2
Nuclear interaction length	220.2	g cm-2
Pion collision length	146.6	g cm-2
Pion interaction length	246.0	g cm-2
Radiation length	5.26	g cm-2
Critical energy	6.02	MeV (for e-)
Molière radius	18.55	g cm-2
Plasma energy ℏωp	67.74	eV
Muon critical energy	112.	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 is no stable isotope, [atomic mass] is that of the longest-lived isotope known as of Jun 2017.
Note: Density 14.0 g/cm³ and I_eff = 1115 eV assumed in calculating critical energies and dE/dx.
Table of isotopes via WIKIPEDIA