1 · H
Hydrogen
Identified as inflammable air by Cavendish in 1766 and named hydrogen by Lavoisier in 1783.
Identity
- Atomic number
- 1
- Symbol
- H
- Canonical name
- Hydrogen
- Category
- nonmetal
- Group
- 1
- Period
- 1
- Block
- s
A nonmetal. Its configuration is sometimes compared with the alkali metals, without making it one of them.
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- 1.008 u
- Electron configuration
- 1s1
- Electrons per shell
- 1
- Standard state
- gas
- Density
- 0.08988 g/L
- Melting point
- 13.99 K
- Boiling point
- 20.271 K
- Electronegativity
- 2.2 Pauling
- First ionization energy
- 1,312 kJ/mol
- Electron affinity
- 72.769 kJ/mol
History
Identification of inflammable air
Identification · confirmed · 1766
Cavendish isolates an inflammable gas and measures its density. He does not name it hydrogen.
The name hydrogen
Naming · confirmed · 1783
Lavoisier treats the gas as an element and names it for the water it forms when burned.
Etymology
- Theme
- property
- Language
- grec
- Root
- hydrogenes
- Meaning
- water-former
Scientists
Places and institutions
- London — historical setting : United Kingdom — present country : United Kingdom
- Paris — historical setting : France — present country : France
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements