The image is based around the familiar radiation hazard symbol and reflects the unstable and reactive nature of the element. astatine - a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium. Learn more. Astatine is a chemical compound with symbol At and atomic number 85, which is a radioactive element. Astatine definition is - a radioactive halogen element discovered by bombarding bismuth with alpha particles and also formed by radioactive decay. Astatine is the 85th element of the periodic table with a symbol ‘At’. Its properties are inferred from its position in the periodic table and by studying its chemistry in extremely dilute solutions. Astatine is a radioactive chemical element wi the chemical seembol At an atomic nummer 85. Due to its scarcity, astatine is produced when it is needed. Alkaline earth metal. Radium. It occurs on Earth as the decay product of various heavier elements. The half-life of the most stable isotope is only 8 hours, and only tiny amounts have ever been produced. Element Category: Alkaline earth metal. It has about seven isotopes. Astatine (IPA: /ˈastətiːn/) is a chemical element in the periodic table that has the symbol At and atomic number 85. While it is a halogen (a nonmetal), it has more At, atomic number 85. chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter. Characteristics: Astatine is highly radioactive and is only available in tiny quantities. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. The last element of the group of metalloids is astatine. Astatine's most stable isotope, astatine-210, has a half-life of 8.1 hours. Astatine can also react with hydrogen to form hydrogen astatide, which when dissolved in water, forms hydroastatic acid. Astatine may be of use in the treatment of hyperthyroidism because it emits ALPHA PARTICLES. It is the heaviest of the discovered halogens. Like the other halogens, astatine would be expected to form salts with metals such as sodium. All its isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours. Discoverer: Curie, Marie and Pierre. Astatine is highly radioactive and like the other halogens would be expected to form salts with metals such as sodium. Astatine is named after a Greek word astatos, meaning unstable. 226 amu. A total of 0.05 micrograms (0.00000005 grams) of astatine have been produced to date. Uses. It has been estimated that the whole Earth's crust contains less than 44 mg astatine and this element with the atomic number 85 can thus be considered one of the rarest naturally occurring elements on Earth. Astatine (At) is a radioactive non-metal that has the atomic number 85 in the periodic table in Group 17. The atomic number of astatine is 85 and it is represented by symbol At. Astatine (85 At) has 39 known isotopes, all of which are radioactive; the range of their mass numbers is from 191 to 229.There also exist 23 metastable excited states.The longest-lived isotope is 210 At, which has a half-life of 8.1 hours; the longest-lived isotope existing in naturally occurring decay chains is 219 At with a half-life of 56 seconds. Astatine Element: Astatine is a radioactive element and it is a member of group 17 and period 6 in the periodic table. Symbol: At; atomic number: 85. It was predicted to exist by Mendeleev and he called it eka-iodine. Astatine is a dangerously radioactive element. Accordinly, much less is kent aboot astatine nor maist ither elements. Unlike iodine-131, however, astatine-211 doesn’t release beta-radiation. Ra. Although if one does come into contact with it, astatine is thought to accumulate in the thyroid gland similarly to iodine. Astatine 211 is not only an alpha emitter, it has also got a very short half life and the fact that it decays to a stable non-radioactive isotope of lead means that the radiation dose is quite brief. It occurs on Earth as the decay product of various heavier elements. It is a chemical that is radioactive with a symbol of At and an atomic number of 85. Radium. Astatine is a very rare and radioactive element, which makes it quite difficult to work with. Astatine is highly radioactive yet poses nearly no health or environmental effects at all due to its rarity and very short half-lives, according to Lenntech. The chemical symbol for Radium is Ra. Highly radioactive. Although if one does come into contact with it, astatine is thought to accumulate in the thyroid gland similarly to iodine. It belongs to the halogen family. Element Category: Alkaline earth metal. Astatine. Astatine is classed as a halogen and a non metal. 88. It has the distinction of being the rarest natural element found in the Earth's crust, as it is only produced from radioactive decay of even heavier elements. It is the rarest naturally occurring element on the Earth's crust. Its isotopes range in mass number from 200 to 219 and all have an extremely short half-life. Francium is a highly radioactive metal that decays into astatine, radium, and radon. Astatine is a solid at room temperature because of its intramolecular attraction. It has the abbreviation of At and an atomic number of 85. Although the irradiation of astatine can be prevented to a certain degree by cooling, this method is not enough for a complete understanding of its properties. Chlorine, Iodine and Bromine are the other elements in the halogen family. See more. Aw o its isotopes are short-lived; the maist stable is astatine-210, wi a hauf-life o 8.5 oors. 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