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Astatine-218 was the first astatine isotope discovered in nature. [113] Astatine-219, with a half-life of 56 seconds, is the longest lived of the naturally occurring isotopes. [6] Isotopes of astatine are sometimes not listed as naturally occurring because of misconceptions [103] that there are no such isotopes, [114] or discrepancies in the ...
Astatine (At) 85 ἄστατος (astatos) Greek "unstable" From Greek ἄστατος (astatos), meaning "unstable". · Former name alabamine (Ab) was an earlier proposed name for astatine Radon (Rn) 86 radium: Latin via German and English [57] Contraction of radium emanation, since the element appears in the radioactive decay of radium.
The name of Greece differs in Greek compared with the names used for the country in other languages and cultures, just like the names of the Greeks.The ancient and modern name of the country is Hellas or Hellada (Greek: Ελλάς, Ελλάδα; in polytonic: Ἑλλάς, Ἑλλάδα), and its official name is the Hellenic Republic, Helliniki Dimokratia (Ελληνική Δημοκρατία ...
Astatine is also thought to be capable of forming cations in salts with oxyanions such as iodate or dichromate; this is based on the observation that, in acidic solutions, monovalent or intermediate positive states of astatine coprecipitate with the insoluble salts of metal cations such as silver(I) iodate or thallium(I) dichromate.
The southern boundary is not mentioned; however, Apis is said to have come to Argos from Naupactus "across" (peras), [33] implying that Argos includes all of east Greece from the north of Thessaly to the Peloponnesian Argos, where the Danaids are probably to be conceived as having landed. He claims to rule the Pelasgians and to be the "child of ...
The four classical elements (fire, air, water, earth) of Empedocles illustrated with a burning log. The log releases all four elements as it is destroyed. The earliest Greek philosophers, known as the pre-Socratics, were materialists who provided alternative answers to the same question found in the myths of their neighbors: "How did the ordered cosmos in which we live come to be?"
Organoastatine chemistry describes the synthesis and properties of organoastatine compounds, chemical compounds containing a carbon to astatine chemical bond. Astatine is extremely radioactive, with the longest-lived isotope (210 At) having a half-life of only 8.1 hours. Consequently, organoastatine chemistry can only be studied by tracer ...
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