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Hydrogen
diatomic nonmetal· Gas·1.008 u
Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of 1.00794 u, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.
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Identity
- Symbol
- H
- Atomic Number
- 1
- Atomic Mass
- 1.008 u
- Category
- diatomic nonmetal
- Block
- s-block
- Period
- 1
- Group
- 1
- Appearance
- colorless gas
- Year Discovered
- 1766 CE
- Discovered By
- Henry Cavendish
- Named By
- Antoine Lavoisier
Electrons
- Configuration
- 1s1
- Full Configuration
- 1s1
- Shells
- 1
- Electronegativity
- 2.2
- Electron Affinity
- 72.769
- Oxidation States
- +1, -1
- Ionization Energies
- 1312
Physical Properties
- State at
- Gas
- Melting Point
- 13.99
- Boiling Point
- 20.271
- Density
- 0.08988
- Molar Heat
- 28.836 J/(mol·K)
- Crystal Structure
- HEX
- Magnetic Ordering
- Diamagnetic
Mechanical
- Atomic Radius
- 53 pm
- Covalent Radius
- 32 pm
- Van der Waals
- 120 pm
Thermal & Electrical
- Thermal Conductivity
- 0.1805 W/(m K) W/(m·K)
- Specific Heat
- 14,300 J/(kg K) J/(g·K)
- Heat of Vaporization
- 0.44936 kJ/mol kJ/mol
- Heat of Fusion
- 0.05868 kJ/mol kJ/mol
Abundance
- Universe
- 75%
- Sun
- 75%
- Meteorite
- 2.4%
- Earth's Crust
- 0.15%
- Ocean
- 11%
- Human Body
- 10%