Hydrogen astatide, also known as
astatine hydride, astatane, or astidohydrogen, is a chemical compound with the chemical formula HAt,
Kaynak: Hydrogen astatideThe element, also known as eka -
astatine or simply element 117, is the second-heaviest of all the elements that have been reportedly
Kaynak: Ununseptiuminterhalogen compound is a molecule whose atom contains two or more different halogen atoms (fluorine , chlorine , bromine , iodine or
astatine ).
Kaynak: InterhalogenFrancium is a highly radioactive metal that decays into
astatine , radium , and radon . As an alkali metal , it has one valence electron
Kaynak: Franciumperiodic table consisting of five chemically related elements , fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and
astatine (At).
Kaynak: HalogenOther elements less commonly recognised as metalloids include carbon , aluminium , selenium , polonium and
astatine . end and
astatine at
Kaynak: Metalloidtechnetium , atomic number 43; promethium , number 61;
astatine , number 85; francium , number 87; neptunium , number 93; plutonium ,
Kaynak: Chemical elementShe discovered that the element 85
astatine is a product of the natural decay processes. The element was first synthesized in 1940 by Dale
Kaynak: Berta KarlikHelvetium was the suggested name of chemical element number 85 , now known as
astatine, given to it by the Swiss chemist Walter Minder .
Kaynak: HelvetiumAmong
astatine isotopes, six (with mass number s 214 to 219) are present in nature as the result of decay of heavier elements; however,
Kaynak: Period 6 elementKenneth Ross MacKenzie (June 15, 1912 – July 4, 2002 together with Dale R. Corson and Emilio Segrè , synthesized the element
astatine , in
Kaynak: Kenneth Ross MacKenzieAlong with fluorine , bromine , iodine , and
astatine , chlorine is a member of the halogen series that forms the group 17 (formerly VII,
Kaynak: ChlorineIn Group 17: (the halogens ): fluorine (F), chlorine (Cl), bromine (Br), iodine (I),
astatine ( At ) All elements (with the possible
Kaynak: Nonmetalof element 85 (now called
astatine in 1940 and 1942 He proposed the name helvetium in 1940 and anglohelvetium in 1942 for the new element.
Kaynak: Walter Minder