Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
- 1 decade agoFavorite Answer
Atomic Number: 1
Atomic weight: 1.0079
Discovery: Cavendish, 1766. Hydrogen was prepared for many years before it was recognized as a distinct element.
Electron Configuration: 1s1
Word Origin: Greek: hydro, water; genes, forming Named by Lavoisier.
Isotopes: Protium (0 neutrons), Deuterium (1 neutron), and Tritium (2 neutrons)
Ground level: 2S1/2
Ionization potential: 13.5984 ev
Physical form: Colorless gas
Melting point: -259.2°C
Boiling point: -252.762°C
Critical temperature: -240.18°C
Density: 0.082 g/LSource(s): chemistry.about.com
- YeungLv 71 decade ago