Hydrogen at Chemical Elements.com 


 

Basic Information


Name: Hydrogen
Symbol: H
Atomic Number: 1
Atomic Mass: 1.00794 amu
Melting Point: -259.14 °C (14.009985 °K, -434.45203 °F)
Boiling Point: -252.87 °C (20.280005 °K, -423.166 °F)
Number of Protons/Electrons: 1
Number of Neutrons: 0
Classification: Non-metal
Crystal Structure: Hexagonal
Density @ 293 K: 0.08988 g/cm3
Color: colorless


Atomic Structure

[Bohr Model of Hydrogen]  
Number of Energy Levels: 1

    First Energy Level: 1

Isotopes

Isotope Half Life
H-1 Stable
H-2 Stable
H-3 12.3 years

Facts


Date of Discovery: 1766
Discoverer: Henry Cavendish
Name Origin: From the Greek words hudôr (water) and gennan (generate)
Uses: Balloons, metal refining
Obtained From: mines, oil, gas wells