
Curium (Cm) is a chemical element of the periodic table, located in the period 7, and has the atomic number 96. It is the eighth element in the actinide series. It is a hard, silvery-white metal which is named in honour of Marie and Pierre Curie. It is the fourth transuranium element and is counted as one of the radioactive elements.
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– f block |
FAQs on Curium Element
Curium |
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‣ What does curium look like? Appearance: silvery metallic, glows purple in the dark |
‣ Who discovered curium and in what year? Discovery: Glenn T. Seaborg, Ralph A. James, Albert Ghiorso (1944) |
‣ Where is curium found on the periodic table?![]() Location: Curium is found in the seventh row of the periodic table, next to the americium element. |
‣ What is the atomic number of curium? Atomic number (Z): 96 |
‣ What is the symbol of curium? Symbol: Cm |
‣ Curium atomic weight: [247] |
‣ What block does curium belong to? Block: f-block |
‣ What period is curium in on the periodic table? Period: 7 |
‣ Curium atomic radius: empirical: 174 pm |
‣ Curium covalent radius: 169±3 pm |
‣ Curium melting point: 1613 K (1340 °C, 2444 °F) |
‣ What is curium boiling point? Boiling point: 3383 K (3110 °C, 5630 °F) |
‣ How many electron shells does curium have? Electrons per shell: 2, 8, 18, 32, 25, 9, 2 |
‣ What is the electron configuration of curium? Electron configuration: [Rn] 5f7 6d1 7s2 |
‣ Curium ionization energies: 1st: 581 kJ/mol |
‣ What is the phase of curium? Phase (at r.t): solid |
‣ What is the density of the element curium? Density (near r.t): 13.51 g/cm3 |
‣ Curium magnetic ordering: antiferromagnetic-paramagnetic transition at 52 K |
‣ Curium natural occurrence: synthetic |
‣ Curium oxidation state: +3 |
‣ What’s the electronegativity of curium? Electronegativity: Pauling scale: 1.3 |
‣ Curium heat of fusion: 13.85 kJ/mol |
‣ Curium crystal structure: double hexagonal close-packed (dhcp) |
‣ Curium electrical resistivity: 1.25 µΩ.m |
‣ Curium CAS number: 7440-51-9 |
‣ Curium vapor pressure
Vapor pressure | ||||||
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P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
at T (K) | 1788 | 1982 |
‣ How many isotopes does curium have?
Main isotopes of curium | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
242Cm | syn | 160 d | SF α | – 238Pu |
243Cm | syn | 29.1 y | α ε SF | 239Pu 243Am – |
244Cm | syn | 18.1 y | SF α | – 240Pu |
245Cm | syn | 8500 y | SF α | – 241Pu |
246Cm | syn | 4730 y | α SF | 242Pu – |
247Cm | syn | 1.56 × 107 y | α | 243Pu |
248Cm | syn | 3.40 × 105 y | α SF | 244Pu – |
250Cm | syn | 9000 y | SF α β– | – 246Pu 250Bk |
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