Curium |
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Pronunciation | (KEWR-ee-əm) |
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Appearance | sillery metallic, glows purpie in the dark |
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Mass number | [247] |
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Curium in the periodic cairt |
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Gd ↑ Cm ↓ (Uqo) |
americium ← curium → berkelium |
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Atomic nummer (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 confeeguration | [Rn] 5f7 6d1 7s2 |
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Electrons per shell | 2, 8, 18, 32, 25, 9, 2 |
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Pheesical properties |
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Phase at STP | solit |
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Meltin pynt | 1613 K (1340 °C, 2444 °F) |
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Bylin pynt | 3383 K (3110 °C, 5630 °F) |
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Density (near r.t.) | 13.51 g/cm3 |
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Heat o fusion | 13.85 kJ/mol |
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Vapour pressur
P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
at T (K) |
1788 |
1982 |
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Atomic properties |
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Oxidation states | +2, +3, +4, +5,[1] +6[2] (an amphoteric oxide) |
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Electronegativity | Pauling scale: 1.3 |
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Ionisation 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 o curium |
Ither properties |
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Naitural occurrence | synthetic |
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Creestal structur | dooble hexagonal close packed |
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Electrical resistivity | 1.25 µΩ·m[3] |
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Magnetic orderin | antiferromagnetic-paramagnetic transition at 52 K[3] |
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CAS Nummer | 7440-51-9 |
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History |
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Namin | named after Marie Skłodowska-Curie an Pierre Curie |
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Diskivery | Glenn T. Seaborg, Ralph A. James, Albert Ghiorso (1944) |
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Main isotopes o curium |
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Isotope |
Abundance |
Hauf-life (t1/2) |
Decay mode |
Product |
242Cm |
syn |
160 d |
SF |
– |
α |
238Pu |
243Cm |
syn |
29.1 y |
α |
239Pu |
ε |
243Am |
SF |
– |
244Cm |
syn |
18.1 y |
SF |
– |
α |
240Pu |
245Cm |
syn |
8500 y |
SF |
– |
α |
241Pu |
246Cm |
syn |
4730 y |
α |
242Pu |
SF |
– |
247Cm |
syn |
1.56×107 y |
α |
243Pu |
248Cm |
syn |
3.40×105 y |
α |
244Pu |
SF |
– |
250Cm |
syn |
9000 y |
SF |
– |
α |
246Pu |
β− |
250Bk |
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| references |