We Use Cookies
We use cookies and other tracking technologies to improve your browsing experience on our website, to show you personalized content and targeted ads, to analyze our website traffic, and to understand where our visitors are coming from. For more information, please review our cookie policy and privacy policy.
By choosing I Accept, you consent to our use of cookies and other tracking technologies.

Hydrogen (H)

From Wikipedia, the free encyclopediaHydrogen 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.

Hydrogen in the periodic table

Atomic number1
Element categoryNonmetal

Physical properties

Phase at STPGas
Density0.08988 g/cm3
Atomic weight1.0079 u
Melting point13.99 K
-259.16 °C
-434.488 °F
Boiling point20.271 K
-252.879 °C
-423.1822 °F

Atomic properties

Electronegativity (Pauling Scale)2.2
Electron affinity72.769 kJ/mol
Oxidation states−1, +1
(an amphoteric oxide)
Ionization energies
11312 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)1s1
Electron configuration1s1
Electrons per shell1


Discovered byHenry Cavendish
Named byAntoine Lavoisier
Warning: Undefined variable $footer in /customers/a/d/1/periodictable.one/httpd.www/inc/footer.php on line 34