Atomic Number of Thallium

Thallium Atomic Number

Atomic Number of Thallium is 81.

Chemical symbol for Thallium is Tl. Number of protons in Thallium is 81. Atomic weight of Thallium is 204.38 u or g/mol. Melting point of Thallium is 303,6 °C and its the boiling point is 1457 °C.

» Boiling Point » Melting Point » Abundant » State at STP » Discovery Year

About Thallium

Thallium is a soft light grey color metal which reacts quite easily with air. In this reaction thallium becomes of a slightly green color, and its name is derived from a Greek word meaning green tint. This element is very toxic and can cause serious damage to a loving organism. It is carcinogenic. Thallium is extracted from a number of natural ores. Due to high toxicity of this element, its uses are limited to preparing various kinds of poisons, as well as producing glass, some photoelectric elements, etc.

Properties of Thallium Element

Atomic Number (Z)81
Atomic SymbolTl
Atomic Weight204.38 u
Density11.85 g/cm3
Melting Point (K)577 K
Melting Point (℃)303,6 °C
Boiling Point (K)1746 K
Boiling Point (℃)1457 °C
Heat Capacity0.129 J/g · K
Abundance0.85 mg/kg
State at STPSolid
Electronegativity (Pauling) χ1.62
Ionization Energy (eV)6.1082
Atomic Radius190pm
Covalent Radius148pm
Van der Waals Radius196
Valence Electrons3
Year of Discovery1861

What is the Boiling Point of Thallium?

Thallium boiling point is 1457 °C. Boiling point of Thallium in Kelvin is 1746 K.

What is the Melting Point of Thallium?

Thallium melting point is 303,6 °C. Melting point of Thallium in Kelvin is 577 K.

How Abundant is Thallium?

Abundant value of Thallium is 0.85 mg/kg.

What is the State of Thallium at Standard Temperature and Pressure (STP)?

State of Thallium is Solid at standard temperature and pressure at 0℃ and one atmosphere pressure.

When was Thallium Discovered?

Thallium was discovered in 1861.