Thorium

Actinide

Symbol: Th

Atomic Number: 90

Standard State: Solid

Atomic Mass: 232.038

Electron Configuration: [Rn]7s2 6d2

Electronegativity: 1.3

Atomic Radius: 237

Ionization Energy: 6.08

Melting Point: 2023

Boiling Point: 5061

Density: 11.72

Year Discovered: 1828