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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