Astatine Element in Periodic Table | Atomic Number Atomic Mass

Astatine Element:

Astatine is a radioactive element and it is a member of group 17 and period 6 in the periodic table. The atomic number of astatine is 85 and it is represented by symbol At. It belongs to the halogen family. Chlorine, Iodine and Bromine are the other elements in the halogen family.  It is the heaviest element in the halogen family. Astatine is the rarest naturally occurring element in the Earth’s crust. Astatine isotopes are short-lived. Astatine -210 is the most stable isotope, with a half-life of 8.1 hours. It reacts with hydrogen to produce hydrogen astatide. The chemical properties of astatine are similar to iodine.

Astatine Element Information:

Discovery year:1940

Discovered by: Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè

Atomic number: 85

Relative atomic mass: [210] 

Electron configuration: [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵

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, Thallium, Lead, Bismuth, Polonium, 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, Thallium, Lead, Bismuth, Polonium and Radon are the elements in the same period.

Group: group 17 (halogens)

Other elements in the same group:

Fluorine, Chlorine, Bromine, Iodine and Tennessine are the same group elements.

Other elements in the same orbital:

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

Allotropes: none

Key isotopes: ²¹⁰At, ²¹¹At 

Melting point: 300°C, 572°F, 573 K

Boiling point: 350°C, 662°F, 623 K

Element category:  metalloid

Density (g cm⁻³): Unknown

CAS number: 7440-68-8

Color: unknown

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.