Hydrogen (H) properties

Atomic mass, symbol and atomic number

hydrogen is a naturally occurring element with the element symbol H and the ordinal number 1. In the periodic table it stands with an atomic mass of 1.008 u in the 1st main group. The chemical element discovered by Henry Cavendish in 1766 is not radioactive and is in a gaseous state at room temperature.

Profile: Hydrogen

Chemical element:hydrogen
Atomic number:1
Block:s block
explorers:Henry Cavendish
Year of discovery:1766
Atomic properties
Atomic mass:1,008 u
Atomic radius:25 pm
Covalent radius:31 pm
Van der Waals radius:120 pm
Electron configuration:1s1
ionization:1312 kJ / mol
Physical Properties
Physical state:gaseous
Crystal structure:/
molar volume:11,42 · 10-6 m3/ mol
Mohs hardness:/
Melting point:-259 ° C
Boiling point:-252 ° C
Heat of fusion:0.55 kJ / mol
Heat of vaporization:0.90 kJ / mol
Thermal conductivity:0.18 W
Chemical properties

Did you know that ...

  • Hydrogen on Earth does not occur in the form of atomic hydrogen (H), but only as a bound molecule (H2)?
  • Hydrogen in the universe is the most common element?
  • elementary hydrogen has no neutron?
  • Hydrogen was used as a balloon gas despite its slight danger of explosion?
  • Hydrogen bombs release more energy than uranium-based atomic bombs?
  • it is possible to detect hydrogen by means of the oxyhydrogen gas sample?
  • Hydrogen was discovered as early as 1766 by the chemist Henry Cavendish?