Thorium Element in Periodic Table | Atomic Number Atomic Mass

Thorium Element:

Thorium is the second chemical element in the actinide series of periodic table, preceded by actinium. Thorium is represented by the symbol Th and its atomic number is 90. Thorium is like actinium is highly radioactive. Its most stable isotope Th-232 is considered as existing from times immemorial and primordial like uranium. Thorium is found in minerlas like monazite, euxenite and thorianite. The abundance of thorium in earth’s crust is three more than uranium and is found in oxidized form.

Thorium Element Information:

Discovery year:1829

Discovered by: Jöns Jakob Berzelius

Atomic number: 90

Relative atomic mass: 232.038 

Electron configuration: [Rn] 6d² 7s²

Block: f-block

Other elements in the same block:

Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium and  Lawrencium are the elements in the same block.

Period: period 7 

Other elements in the same period:

Francium, Radium, Actinium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium, Lawrencium, Rutherfordium, Dubnium, Seaborgium, Bohrium, Hassium, Meitnerium, Darmstadtium, Roentgenium, Copernicium, Nihonium, Flerovium, Moscovium, Livermorium, Tennessine and Oganesson.

Group: Actinides

Other elements in the same group:

Protactinium, Uranium, Neptunium, Plutonium, Americium,  Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium and Lawrencium are the elements in the same group.

Other elements in the same orbital:

Actinium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium and Lawrencium are the elements in the same orbital.

Allotropes: none

Key isotopes: ²³⁰Th, ²³²Th 

Melting point: 1750°C, 3182°F, 2023 K  

Boiling point: 4785°C, 8645°F, 5058 K

Element category:  actinide

Density (g cm⁻³): 11.7

CAS number: 7440-29-1

Color: silvery

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