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Hydrogen


1
1
1.00794
KEY
Chemical Element Symbol Key

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Hydrogen
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Helium (He)
Symbol: H
Atomic Number: 1
Atomic Weight: 1.00794
Element Classification: Non-Metal
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 (@20°C J/g mol): 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):
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 (Å): 3.750
Lattice C/A Ratio: 1.731


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