Atomic and nuclear properties of materials:
Chlorine gas (Cl₂) (Cl)

Quantity	Value	Units	Value	Units
Atomic number	17
Atomic mass	35.453(2)	g mole-1
Specific gravity (20° C, 1 atm)	2.98E-03	g cm-3
Mean excitation energy	174.0	eV
Minimum ionization	1.630	MeV g-1cm2	4.856E-03	MeV cm-1
Nuclear collision length	73.8	g cm-2	2.476E+04	cm
Nuclear interaction length	115.7	g cm-2	3.882E+04	cm
Pion collision length	99.5	g cm-2	3.340E+04	cm
Pion interaction length	144.9	g cm-2	4.864E+04	cm
Radiation length	19.28	g cm-2	6469.	cm
Critical energy	40.05	MeV (for e-)	39.04	MeV (for e+)
Molière radius	10.21	g cm-2	3425.	cm
Plasma energy	1.09	eV
Muon critical energy	592.	GeV
Melting point	171.6	K	-101.5	C
Boiling point @ 1 atm	239.1	K	-34.04	C
Index of refraction (@ STP, Na D)	773.	(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