Periodic System for Chemists

Your periodic table, always with you.

Use it offline. Find elements quickly. Keep favorites and personal notes on iPhone and iPad.

Actinides

Radioactive elements with atomic numbers 89-103. All isotopes are radioactive.

Discovery Period: 18th to 20th century (1789-1974)

Characteristics

  • • All are radioactive
  • • Silvery or silvery-white metals
  • • Multiple oxidation states
  • • Form complex ions
  • • Used in nuclear technology
  • • Mostly synthetic elements

Elements (14)

89
Ac
Actinium
90
Th
Thorium
91
Pa
Protactinium
92
U
Uranium
93
Np
Neptunium
94
Pu
Plutonium
95
Am
Americium
96
Cm
Curium
97
Bk
Berkelium
98
Cf
Californium
99
Es
Einsteinium
100
Fm
Fermium
101
Md
Mendelevium
102
No
Nobelium

iPhone & iPad

Your periodic table, always with you.

  • Access element data offline, in the lab or in class.
  • Find elements quickly by name, symbol, or atomic number.
  • Save favorite elements and add your own notes.
Published App Store screenshots: periodic table, element details, and search (English).