1

H

Hydrogen

1.0078

Discovery

Cavendish, Henry (1776)

Etymology

Greek via Latin and French

Meaning

Creation of water

Electron configuration

Electron configuration

Crystal structure

Crystal structure

Hexagonal

Physical Properties

Phase

  (at 21 °C and 101.325 kPa)

Gas

Melting point

  (at 101.325 kPa)

-259.0 °C

14.15 K

Boiling point

  (at 101.325 kPa)

-253.0 °C

20.15 K

Density

  (at 21 °C and 101.325 kPa)

0.09 g/cm3

Electronegativity

2.20