Hydrogen is the first element in the periodic table and it has the atomic number 1 and it is the most common element in the universe means almost 90% of all atoms are hydrogen atoms. The name ‘Hydrogen’ is given by Antoine Lavoisier because this element present in every water molecule. Hydrogen is used in Rocket fuels, nuclear energy, Ammonia synthesis, etc. It has no color and odor as well as it is lightest gas as compared with other gases.

Discovered By: Henry Cavendish.
Discovery year: 1766.

The following table showing some properties of Hydrogen:



Table Example
Symbol H
Atomic Number 1
Atomic weight 1.0079
Phase (at 20°C) Gas
Melting point -259.14°C
Boiling point -252.87°C
Color Colorless
Electrons 1
Protons 1
Neutrons 0


Table Example
Oxidation states -1, +1
Electron configuration 1s^1
Covalent radius 31 picometer
Van der Waals radius 120 picometer
Block s
Period 1
Magnetic type Diamagnetic
Radioactive No
Crystal structure Hexagonal
Electronegativity 2.20
Key isotopes