Symbol:
H
Atomic Number:
1
Atomic Weight:
1.00794
Element Classification:
Discovered By:
Henry Cavendish
Discovery Date:
1766 (England)
Name Origin:
Greek: hydro (water) and genes (generate)
Density (g/cc):
0.0708 (@ -253�C)
Melting Point (K):
14.01
Boiling Point (K):
20.28
Appearance:
Colorless, odorless, tasteless gas
Atomic Radius (pm):
79
Atomic Volume (cc/mol):
14.1
Covalent Radius (pm):
32
Ionic Radius:
154 (-1e)
Specific Heat:
14.267 (H-H)
Fusion Heat (kJ/mol):
0.117 (H-H)
Evaporation Heat (kJ/mol):
0.904 (H-H)
Thermal Conductivity (@25°C W/m K):
0.1815
Debye Temperature (K):
110.00
Pauling Negativity Number:
2.20
First Ionizing Energy (kJ/mol):
1311.3
Oxidation States:
1, -1
Electronic Configuration:
1s1
Lattice Structure:
Hexagonal(HEX)
Lattice Constant:
3.750
Lattice C/A Ratio:
1.731
