
Astatine (At) is a chemical element of the periodic table, located in the group 17 and the period 6, and is having the atomic number 85. It is a dark, black, lustrous post transition metal, whose name comes from the Greek word “astatos”, which means unstable. It is highly toxic and is counted as one of the radioactive elements. It is the rarest element on earth and is counted as one of the heaviest elements in the halogen group.
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– p block |
FAQs on Astatine Element
Astatine |
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‣ What does astatine look like? Appearance: unknown, probably metallic |
‣ When was the element astatine discovered and by who? Discovery: Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segre (1940) |
‣ Where is astatine located on the periodic table?![]() Location: Astatine is found in the sixth row of the periodic table below the iodine element. |
‣ What is the atomic number of astatine? Atomic number (Z): 85 |
‣ What is the chemical symbol of astatine? Symbol: At |
‣ Astatine atomic weight: [210] |
‣ What block does astatine belong to? Block: p-block |
‣ What group is astatine in on the periodic table? Group: 17 (halogens) |
‣ What period is astatine in the periodic table? Period: 6 |
‣ How many electron shells does astatine have? Electrons per shell: 2, 8, 18, 32, 18, 7 |
‣ What is the electron configuration of astatine? Electron configuration: [Xe] 4f14 5d10 6s2 6p5 |
‣ What is the ionization energy of astatine? Ionization energies: 1st: 899.003 kJ/mol |
‣ What is the phase of astatine? Phase (at r.t): unknown phase |
‣ Astatine natural occurrence: from decay |
‣ Astatine oxidation state: -1, +1, +3, +5, +7 |
‣ Astatine CAS number: 7440-68-8 |
‣ How many isotopes does astatine have?
Main isotopes of astatine | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
209At | syn | 5.41 h | β+ α | 209Po 205Bi |
210At | syn | 8.1 h | β+ α | 210Po 206Bi |
211At | syn | 7.21 h | ε α | 211Po 207Bi |
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