90 Th Thorium 232.04 u

Thorium

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Period
7
Group
—
Block
f-block
Phase (STP)
Solid

Thorium is a weakly radioactive actinide being researched as a nuclear fuel. It is more abundant than uranium in Earth's crust.

Physical Properties

Atomic Mass 232.04 u
Phase at STP Solid

Electronic Properties

Electronegativity 1.3

Electron Configuration

Configuration [Rn] 6d² 7s²

Electron Shell Configuration

Thorium electron shell configuration Th 2e⁻ 8e⁻ 18e⁻ 32e⁻ 18e⁻ 10e⁻ 2e⁻

Position in Periodic Table

Thorium position in the periodic table Th

Block & Period

Block

s p d f

Period

1 2 3 4 5 6 7

Periodic Table

Lanthanides Actinides

Reactions Involving Th

Alpha Decay of Thorium-232

²³²Th → ²²⁸Ra + ⁴He

Nuclear

Alpha Decay of Uranium-238

²³⁸U → ²³⁴Th + ⁴He

Nuclear

More Actinide

89 Ac Actinium 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

Frequently Asked Questions

What is Thorium?
Thorium (Th) is a chemical element with atomic number 90. It is a solid at standard temperature and pressure, classified as a actinide.
What are the key properties of Thorium?
Thorium has an atomic mass of 232.04 u.
What is the electron configuration of Thorium?
The electron configuration of Thorium is [Rn] 6d2 7s2. It is in the f-block of the periodic table.
What is the electronegativity of Thorium?
Thorium has an electronegativity of 1.3 on the Pauling scale.