Atomic and nuclear properties of materials:
Fermium (Fm)

Quantity	Value	Units
Atomic number	100
Atomic mass	[257.09510(5)]	g mole-1
Density	??	g cm-3
Mean excitation energy	994.0	eV
Minimum ionization	1.090	MeV g-1cm2
Nuclear collision length	121.2	g cm-2
Nuclear interaction length	214.5	g cm-2
Pion collision length	144.0	g cm-2
Pion interaction length	240.5	g cm-2
Radiation length	5.62	g cm-2
Critical energy	6.42	MeV (for e-)
Molière radius	18.57	g cm-2
Plasma energy	67.24	eV
Muon critical energy	122.	GeV
Melting point	273.1	K

For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PS PDF TEXT
Table of muon dE/dx and Range: PS PDF TEXT
Explanation of some entries
Note: Since there is no stable isotope, [atomic mass] is that of the longest-lived known isotope as of Jan 2007.
Note: Density 14.0 g/cm³ and I_eff = 994 eV assumed in calculating critical energies and dE/dx.
Table of isotopes Warning: may not be current