Hydrogen

Statistics:

• Name: Hydrogen
• Symbol: H
• Classification: Non-Metal
• Atomic Number: 1
• Atomic Mass: 1.0079 g/mol
• Density: 0.084 g/cm³
• Melting: -259.1°C
• Boiling: -252.9°C
• Protons & Electrons:1
• Neutrons:0
• Discovered: 1766
• Discovered By: Henry Cavendish
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Electrons Per Energy Level:

• Level 1: 1

Isotopes:

Isotope: Half-life

• ¹H: Stable
• ²H: Stable
• ³H: 12.32 Years

Brief Summary

Hydrogen is a Non-Metal with the symbol 'H' and contains 1 Proton & Electron with 0 neutrons in the nucleus of the atom. Hydrogen has an atomic mass of 1.0079 g/mol and, at a temperature of 20°C, has a density of 0.084 g/cm³. It will melt at a temperature of -259.1°C and boil at -252.9°C.

Hydrogen was discovered by Henry Cavendish in 1766 and is named 'Hydrogen' From the Greek words hudôr (water) and gennan (generate).

Some common usages for Hydrogen: Balloons, metal refining.

Definitions and Notes

Density listed is at a temperature of 20°C.

Isotopes are forms of an element who have the same atomic number but different mass because they contain different number of neutrons.

Half-life is the time required for a quantity of a subject to fall to half of its current quantity.

MLA Citing Format

Hydrogen :: H :: 1 - Chemical Element. 22 Nov. 2008 <http://www.chemicalelement.com/element/hydrogen.html>.