Table of Contents
Hydrogen
Helium
The Elements
Element
Symbol
Atomic No.
Atomic Weight
T
boil
T
melt
Density
Hydrogen
H
1
1.00794
20.28 Kelvin
31.81 Kelvin
0.0899 g/cc
Helium
He
2
4.0026
4.216 Kelvin
0.95 Kelvin
0.1785 g/cc