Curium
Curium (pronounced /ˈkjuːriəm/) is a synthetic chemical element with the symbol Cm and atomic number 96. A radioactive metallic transuranic element of the actinide series, curium is produced by bombarding plutonium with alpha particles (helium ions) and was named for Marie Curie and her husband Pierre.
| General | |||||||||||||||
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| Name, Symbol, Number | curium, Cm, 96 | ||||||||||||||
| Chemical series | actinides | ||||||||||||||
| Group, Period, Block | n/a, 7, f | ||||||||||||||
| Appearance | silvery | ||||||||||||||
| Standard atomic weight | (247) g·mol-1 | ||||||||||||||
| Electrons per shell | 2, 8, 18, 32, 25, 9, 2 | ||||||||||||||
| Physical properties | |||||||||||||||
| Phase | solid | ||||||||||||||
| Density (near r.t.) | 13.51 g·cm−3 | ||||||||||||||
| Melting point | 1613K (1340°C, 2444°F) |
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| Boiling point | 3383K (3110°C, 5630°F) |
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| Heat of fusion | ? 15 kJ·mol-1 | ||||||||||||||
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| Atomic properties | |||||||||||||||
| Crystal structure | hexagonal close-packed | ||||||||||||||
| Oxidation states | 3 (amphoteric oxide) |
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| Electronegativity | 1.3 (Pauling scale) | ||||||||||||||
| Ionization energies | 1st: 581 kJ/mol | ||||||||||||||
| Miscellaneous | |||||||||||||||
| Magnetic ordering | no data | ||||||||||||||
| CAS registry number | 7440-51-9 | ||||||||||||||
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