Atomic and nuclear properties of materials:
Fluorine gas (F₂) (F )

Quantity	Value	Units	Value	Units
Atomic number	9
Atomic mass	18.9984032(5)	g mole-1
Specific gravity (20° C, 1 atm)	1.58E-03	g cm-3
Mean excitation energy	115.0	eV
Minimum ionization	1.676	MeV g-1cm2	2.649E-03	MeV cm-1
Nuclear collision length	65.0	g cm-2	4.110E+04	cm
Nuclear interaction length	97.4	g cm-2	6.164E+04	cm
Pion collision length	91.0	g cm-2	5.760E+04	cm
Pion interaction length	127.2	g cm-2	8.052E+04	cm
Radiation length	32.93	g cm-2	2.084E+04	cm
Critical energy	73.15	MeV (for e-)	71.48	MeV (for e+)
Molière radius	9.55	g cm-2	6040.	cm
Plasma energy	0.79	eV
Muon critical energy	960.	GeV
Melting point	53.53	K	-219.6	C
Boiling point @ 1 atm	85.03	K	-188.1	C
Index of refraction (@ STP, Na D)	195.	(n-1)x106

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
Table of isotopes Warning: may not be current
x ray mass attenuation coefficients