Thallium Element in Periodic Table | Atomic Number Atomic Mass

Thallium Element:

Thallium is an element in the 13^th group and 6^th period of periodic table. It is a grey post-transition metal. The atomic number of Thallium is 81 and it is indicated the symbol by Tl. It is a soft element and it is not found free in nature. It is a modestly abundant element in the Earth's crust. Its abundance is estimated to be about 0.7 mg/kg parts per million. Thallium contains 25 isotopes which have atomic masses that range from 184 to 210. ²⁰³Tl and ²⁰⁵Tl are the only stable isotopes and make up nearly all of natural thallium. Thallium and its compounds are very toxic. It’s also suspected as being carcinogenic.

Thallium Element Uses:

• The use of thallium is limited as it is a toxic element. Thallium sulphate has been used as a rat poison and ant killer.
• It is most often used in photoelectric cells, infrared optical equipment, low melting glasses and several other applications.

Thallium Element Information:

Discovery year:1861

Discovered by:William Crookes

Atomic number: 81

Relative atomic mass: 204.38  

Electron configuration: [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹

Block: p-block

Other elements in the same block:

Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Aluminium, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Gallium, Germanium, Arsenic, Selenium, Bromine, Krypton, Indium, Tin, Antimony, Tellurium, Iodine, Xenon, Lead, Bismuth, Polonium, Astatine, Radon, Nihonium, Flerovium, Moscovium, Livermorium, Tennessine and Oganesson are the same block elements.

Period: period 6 

Other elements in the same period:

Caesium, Barium, Lanthanum,  Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Hafnium, Tantalum, Tungsten, Rhenium, Osmium, Iridium, Platinum, Gold, Mercury, Lead, Bismuth, Polonium, Astatine and Radon

Group: group 13 (boron group)

Other elements in the same group:

Boron, Aluminium, Gallium, Indium and Nihonium are the same group elements.

Other elements in the same orbital:

Lead, Bismuth, Polonium, Astatine and Radon are the elements in the same orbital.

Allotropes: none

Key isotopes: ²⁰⁵Tl 

Melting point: 304°C, 579°F, 577 K 

Boiling point: 1473°C, 2683°F, 1746 K

Element category: post-transition metal 

Density (g cm⁻³): 11.8

CAS number: 7440-28-0

Color: silvery white

You can know detailed information for each element,

Hydrogen, Helium, LithiumBeryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine,  Neon , Sodium, Magnesium, Aluminium, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Potassium, Calcium, Scandium, Titanium, Vanadium, Chromium, Manganese, Iron, Cobalt, Nickel, Copper, Zinc, Gallium, Germanium, Arsenic, Selenium, Bromine, Krypton,  Rubidium, Strontium, Yttrium, Zirconium, Niobium, Molybdenum, Technetium, Ruthenium, Rhodium, Palladium, Silver, Cadmium, Indium, Tin, Antimony, Tellurium, Iodine, Xenon,  Caesium, Barium, Lanthanum,  Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Hafnium, Tantalum, Tungsten, Rhenium, Osmium, Iridium, Platinum, Gold, Mercury, Thallium, Lead, Bismuth, Polonium, Astatine, Radon,  Francium, Radium, Actinium, Thorium, 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, Oganesson.