Hydrogen (H)

Hydrogen is the simplest and lightest element, consisting of one proton and one electron. It is the most abundant chemical substance in the universe.

Atomic Number

1

Atomic Mass

1.008 u

Category

nonmetal

Phase

gas

Density

0.00008988 g/cm³

Electron Shells

1

Atomic Structure

Protons: 1 • Electrons: 1 • Neutrons: Varies by isotope

Electron Configuration: 1s¹

Discovery

1766 • Henry Cavendish