1

H

Hydrogen

1.0078

Nonmetal
Gas

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