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Predict the melting and boiling points of astatine, and its state at room temperature. Solubility in water should be of low order. Astatine is formed by bombarding bismuth isotopes with alpha-particles. 2. Density (g cm −3) Density is the mass of a substance that would fill 1 cm 3 at room temperature. Astatine is a solid at room temperature because it's melting point is 302 degrees C and it's boiling point is 337 degrees C. From this we can see that room temperature (around 20 degrees C) is below the temperature at which the element would turn into a liquid, therefore it would be solid. Astatine is a chemical element with symbol At and atomic number 85. These isotopes can be distilled from the target upon heating it in air. Its possible oxidation states include: -1, +1, 3, 5 and 7. Small quantities of At-215, At-218, and At-219 … However, astatine-209, astatine-210, and astatine-211 have the longest half-lives of 5.5 to 8.3 hours. Astatine is the rarest naturally occurring element on the Earth’s crust. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Astatine - Astatine is a radioactive element with an atomic number of 85 and symbol At. Find physical and chemical properties of Astatine (At) like element name, symbol, atomic number, atomic weight, density, color, melting point, boiling point, physical state at room temperature, isotopes, compounds, half life period, category, year of discovery and more It is a chemical that is radioactive with a symbol of At and an atomic number of 85. It occurs on Earth as … Classified as a halogen, Astatine is a solid at room temperature. Sources: Astatine was first synthesized by Corson, MacKenzie, and Segre at the University of California in 1940 by bombarding bismuth with alpha particles.Astatine may be produced by bombarding bismuth with energetic alpha particles to produce At-209, At-210, and At-211. Reveal answer. Hi, the questions are about Astatine: 1. what physical state would you expect astatine to be in at room temperature? The chemical symbol for Astatine is At. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. 4. All 20 isotopes of astatine are radioactive. Describe Hydrogen Astatide, and suggest a likely PH for a reasonably concentrated solution of it in water. What would you expect caesium astatide to look like? Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. The temperature at which the liquid–gas phase change occurs. Astatine is the least chemically reactive of the halogens and exhibits the most metallic properties of the halogen group. Production. Sublimation The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. Astatine-211 is sometimes used as a radioactive tracer and in cancer treatment. Uses of Astatine. Astatine is a very rare element, so there is not that much known about this element. Astatine is volatile and may be distilled in a vacuum at room temperature in a glass apparatus; it may be condensed in a dry ice trap. Would you expect astatine to be more or less reactive than iodine? Astatine can also react with hydrogen to form hydrogen astatide, which when dissolved in water, forms hydroastatic acid. 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