96
Cm
247
Curium
Actinide
Period 7
Block f
Curium is a chemical element of the periodic table with chemical symbol Cm and atomic number 96 with an atomic weight of 247 u and is classed as actinide. Curium is solid at room temperature.
Curium in the periodic table
| Symbol | Cm |
| Atomic number | 96 |
| Group | - |
| Period | 7 |
| Block | f |
| Classification | Actinide |
| Appearance | Silvery metallic, glows purple in the dark |
| Color | Silver |
| Number of protons | 96 p+ |
| Number of neutrons | 151 n0 |
| Number of electrons | 96 e- |
From Wikipedia, the free encyclopediaCurium is a transuranic radioactive chemical element with symbol Cm and atomic number 96. This element of the actinide series was named after Marie and Pierre Curie – both were known for their research on radioactivity. Curium was first intentionally produced and identified in July 1944 by the group of Glenn T. Seaborg at the University of California, Berkeley.
Physical properties
| Phase at STP | Solid |
| Density | 13.51 g/cm3 |
| Atomic weight | 247 u |
Thermal properties
| Melting point | 1613 K 1339.85 °C 2443.73 °F |
| Boiling point | 3383 K 3109.85 °C 5629.73 °F |
| Heat of vaporization | - |
Atomic properties
| Electronegativity (Pauling Scale) | 1.28 |
| Electron affinity | 27.17 kJ/mol |
| Oxidation states | +3, +4, +5, +6 (an amphoteric oxide) |
| Ionization energies |
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Electron configuration for curium
Electron configuration Shorthand configuration | [Rn] 5f7 6d1 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Full configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f7 6s2 6p6 6d1 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Electron configuration chart |
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| Electrons per shell | 2, 8, 18, 32, 25, 9, 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outer shell electrons | 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valency electrons | 3 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bohr model | Figure: Shell diagram of Curium (Cm) atom. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Orbital Diagram
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The history of Curium
| Discovery | Glenn T. Seaborg, Ralph A. James, Albert Ghiorso (1944) |
Discovery of curium Curium was first produced in 1944 by Glenn Seaborg, Ralph James and Albert Ghiorso at Berkeley through alpha-particle bombardment of plutonium-239. It was named in honour of Marie and Pierre Curie, pioneers of radioactivity research. Curium is a silvery, hard, radioactive metal used mainly in research, including as an alpha source and in the production of heavier actinides and plutonium-238 for radioisotope power systems. | |
| Original word | Curie |
| Language of origin | English |
| Name source | Person |
| Meaning | “Marie Curie” |
Naming The element is named in honour of Marie and Pierre Curie, the pioneering researchers of radioactivity. | |