Your periodic table, always with you.

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

Actinium Covalent Radius

Ac - Atomic Number 89

Covalent Radius
215 pm
Ranking:
#92 of 96
Highest
He: 28.00
Lowest
Fr: 260.00

About the Covalent Radius

Covalent radius decreases with higher bond orders due to increased orbital overlap. Values from Pyykkö & Atsumi.

Top 10 by Covalent Radius

Unit Conversions

pm 215.00
Å 2.150
nm 0.2150

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).