
Actinium (Ac) is a chemical element of the periodic table, located in the period 7, and has the atomic number 89. It is the first element in the actinide series. It is a soft, silvery-white metal that glows in the dark with a blue light. Its name comes from the Greek word “aktis” or “aktinos”, which means beam or ray. It is counted as one of the radioactive elements.
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– f block |
FAQs on Actinium Element
Actinium |
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‣ What does actinium look like? Appearance: silvery-white, glowing with an eerie blue light; sometimes with a golden cast |
‣ Who discovered actinium? When was the element actinium discovered? Discovery and first isolation: Friedrich Oskar Giesel (1902, 1903) |
‣ Where is actinium found on the periodic table?![]() Location: Actinium is found in the seventh row of the periodic table, next to the radium element. |
‣ What is the atomic number of actinium? Atomic number (Z): 89 |
‣ Actinium symbol: Ac |
‣ Atomic weight of actinium: [227] |
‣ Actinium belongs to which block? Block: f-block |
‣ Period of actinium in the periodic table Period: 7 |
‣ Actinium covalent radius: 215 pm |
‣ Melting point of actinium: 1500 K (1227 °C, 2240 °F) (estimated) |
‣ What is the boiling point of actinium? Boiling point: 3500±300 K (3200±300 °C, 5800±500 °F) (extrapolated) |
‣ How many electron shells does actinium have? Electrons per shell: 2, 8, 18, 32, 18, 9, 2 |
‣ What is the electron configuration of actinium? Electron configuration: [Rn] 6d1 7s2 |
‣ Actinium ionization energies: 1st: 499 kJ/mol 2nd: 1170 kJ/mol 3rd: 1900 kJ/mol |
‣ What is the phase of actinium? Phase (at r.t): solid |
‣ What is the density of actinium? Density (near r.t): 10 g/cm3 |
‣ Actinium natural occurrence: from decay |
‣ Common oxidation state of actinium: +3 |
‣ What is the electronegativity of actinium? Electronegativity: Pauling scale: 1.1 |
‣ Actinium heat of fusion: 14 kJ/mol |
‣ Actinium heat of vaporization: 400 kJ/mol |
‣ Actinium molar heat capacity: 27.2 J/(mol K) |
‣ What is the structure of actinium? Crystal structure: face centered cubic (fcc) |
‣ Thermal conductivity of actinium: 12 W/(m.K) |
‣ Actinium CAS number: 7440-34-8 |
‣ How many isotopes does actinium have?
Main isotopes of actinium | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
225Ac | trace | 10 d | α | 221Fr |
226Ac | syn | 29.37 h | β– ε α | 226Th 226Ra 222Fr |
227Ac | trace | 21.772 y | β– α | 227Th 223Fr |
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