Atomic NumberAtomic Number of Thallium
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 YearAbout 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 Symbol | Tl |
| Group | 13 |
| Period | 6 |
| Atomic Weight | 204.38 u |
| Density | 11.85 g/cm3 |
| Melting Point (K) | 577 K |
| Melting Point (℃) | 303,6 °C |
| Boiling Point (K) | 1746 K |
| Boiling Point (℃) | 1457 °C |
| Heat Capacity | 0.129 J/g · K |
| Abundance | 0.85 mg/kg |
| State at STP | Solid |
| Occurrence | Primordial |
| Description | Metal |
| Electronegativity (Pauling) χ | 1.62 |
| Ionization Energy (eV) | 6.1082 |
| Atomic Radius | 190pm |
| Covalent Radius | 148pm |
| Van der Waals Radius | 196 |
| Valence Electrons | 3 |
| Year of Discovery | 1861 |
| Discoverer | Crookes |