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Pronunciation | (KEWR-ee-əm) |
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Appearance | silvery metallic, glows purple in the dark |
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Mass number | 247 (most stable isotope) |
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Atomic number (Z) | 96 |
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Group | group n/a |
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Period | period 7 |
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Block | f-block |
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Element category | actinide |
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Electron configuration | [Rn] 5f7 6d1 7s2 |
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Electrons per shell | 2, 8, 18, 32, 25, 9, 2 |
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Phase at STP | Cm: Solid |
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Melting point | 1613 K (1340 °C, 2444 °F) |
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Boiling point | 3383 K (3110 °C, 5630 °F) |
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Density (near r.t.) | 13.51 g/cm3 |
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Heat of fusion | 13.85 kJ/mol |
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Vapor pressureP (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
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at T (K) | 1788 | 1982 | | | | |
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Oxidation states | +2, +3, +4, +5, +6, (an amphoteric oxide) |
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Electronegativity | Pauling scale: 1.3 |
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Ionization energies | |
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Atomic radius | empirical: 174 pm |
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Covalent radius | 169±3 pm |
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Spectral lines of curium |
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Natural occurrence | Cm: Synthetic |
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Crystal structure | double hexagonal close-packed (dhcp) |
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Electrical resistivity | 1.25 µΩ·m |
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Magnetic ordering | antiferromagnetic-paramagnetic transition at 52 K |
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CAS Number | 7440-51-9 |
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Naming | named after Marie Skłodowska-Curie and Pierre Curie |
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Discovery | Glenn T. Seaborg, Ralph A. James, Albert Ghiorso (1944) |
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| references |