Atomic and nuclear properties of materials:
Oxygen gas (O₂) (O )

Quantity	Value	Units	Value	Units
Atomic number	8
Atomic mass	15.9994(3)	g mole-1
Specific gravity (20° C, 1 atm)	1.33E-03	g cm-3
Mean excitation energy	95.0	eV
Minimum ionization	1.801	MeV g-1cm2	2.398E-03	MeV cm-1
Nuclear collision length	61.3	g cm-2	4.606E+04	cm
Nuclear interaction length	90.2	g cm-2	6.772E+04	cm
Pion collision length	88.5	g cm-2	6.644E+04	cm
Pion interaction length	121.9	g cm-2	9.156E+04	cm
Radiation length	34.24	g cm-2	2.571E+04	cm
Critical energy	81.45	MeV (for e-)	79.62	MeV (for e+)
Molière radius	8.91	g cm-2	6695.	cm
Plasma energy	0.74	eV
Muon critical energy	1050.	GeV
Melting point	54.36	K	-218.8	C
Boiling point @ 1 atm	90.20	K	-182.9	C
Index of refraction (@ STP, Na D)	271.	(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