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.

Back to Thorium

Thorium Covalent Radius

Th - Atomic Number 90

Covalent Radius
206 pm
Ranking:
#89 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 206.00
Å 2.060
nm 0.2060

Top 10 by Covalent Radius

#1 He Helium
28.00 pm
#2 H Hydrogen
31.00 pm
#3 F Fluorine
57.00 pm
#4 Ne Neon
58.00 pm
#5 O Oxygen
66.00 pm
#6 N Nitrogen
71.00 pm
#7 C Carbon
73.00 pm
#8 B Boron
84.00 pm
#9 Be Beryllium
96.00 pm
#10 Cl Chlorine
102.00 pm

Related Properties

Atomic MassAtomic RadiusVan der Waals Radius

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).