Cerium (atomic symbol Ce) is element 58 on the periodic table. It is a Lathanide metal discovered in 1803 by Jons Jakob Berzelius and Wihelm Hisinger, and independently by Martin Heinrich Klaproth in the same year. It is named after Ceres, a dwarf planet that was recently disovered at the time (which itself was named after the Roman goddess of agriculture). This element makes up 0.0046% of the Earth's crust by weight, mostly in minerals such as allanite, monazite, and bastnasite. Cerium is of low to moderate toxicity, like all rare-earth metals, and has no significant biological role. The metal can be found in the flints of lighters, and is used widely as various oxides.
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| - Cerium (atomic symbol Ce) is element 58 on the periodic table. It is a Lathanide metal discovered in 1803 by Jons Jakob Berzelius and Wihelm Hisinger, and independently by Martin Heinrich Klaproth in the same year. It is named after Ceres, a dwarf planet that was recently disovered at the time (which itself was named after the Roman goddess of agriculture). This element makes up 0.0046% of the Earth's crust by weight, mostly in minerals such as allanite, monazite, and bastnasite. Cerium is of low to moderate toxicity, like all rare-earth metals, and has no significant biological role. The metal can be found in the flints of lighters, and is used widely as various oxides.
- Cerium is an element that was of value to the Federation. Janus VI was particularly rich in cerium, among many other materials, a fact which was of great interest to the Janus VI colony miners. Three months prior to the USS Enterprise's visit in 2267, a new level was opened in the mines, which contained this element and others. It was one of the examples Vanderberg gave to James T. Kirk when explaining their plight. (TOS: "The Devil in the Dark" )
- Cerium (symbol Ce) is a chemical element, atomic number 58 on the periodic table.
- Cerium is especially interesting because of its variable electronic structure. The energy of the inner 4f level is nearly the same as that of the outer or valence electrons, and only small energy is required to change the relative occupancy of these electronic levels. This gives rise to dual valency states. For example, a volume change of about 10% occurs when cerium is subjected to high pressures or low temperatures. It appears that the valence changes from about 3 to 4 when it is cooled or compressed. The low temperature behavior of cerium is complex. Four allotropic modifications are thought to exist: cerium at room temperature and at atmospheric pressure is known as γ cerium. Upon cooling to –16 °C, γ cerium changes to β cerium. The remaining γ cerium starts to change to α cerium when
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| - Diccionario de cerámica Inglés/Español: Índice adicional
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| - Jöns Jakob Berzelius and Wilhelm Hisinger
- cerium
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| - 58(xsd:integer)
- Named after the dwarf planet 'Ceres'
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| - Cerium (atomic symbol Ce) is element 58 on the periodic table. It is a Lathanide metal discovered in 1803 by Jons Jakob Berzelius and Wihelm Hisinger, and independently by Martin Heinrich Klaproth in the same year. It is named after Ceres, a dwarf planet that was recently disovered at the time (which itself was named after the Roman goddess of agriculture). This element makes up 0.0046% of the Earth's crust by weight, mostly in minerals such as allanite, monazite, and bastnasite. Cerium is of low to moderate toxicity, like all rare-earth metals, and has no significant biological role. The metal can be found in the flints of lighters, and is used widely as various oxides.
- Cerium is an element that was of value to the Federation. Janus VI was particularly rich in cerium, among many other materials, a fact which was of great interest to the Janus VI colony miners. Three months prior to the USS Enterprise's visit in 2267, a new level was opened in the mines, which contained this element and others. It was one of the examples Vanderberg gave to James T. Kirk when explaining their plight. (TOS: "The Devil in the Dark" )
- Cerium (symbol Ce) is a chemical element, atomic number 58 on the periodic table.
- Cerium is especially interesting because of its variable electronic structure. The energy of the inner 4f level is nearly the same as that of the outer or valence electrons, and only small energy is required to change the relative occupancy of these electronic levels. This gives rise to dual valency states. For example, a volume change of about 10% occurs when cerium is subjected to high pressures or low temperatures. It appears that the valence changes from about 3 to 4 when it is cooled or compressed. The low temperature behavior of cerium is complex. Four allotropic modifications are thought to exist: cerium at room temperature and at atmospheric pressure is known as γ cerium. Upon cooling to –16 °C, γ cerium changes to β cerium. The remaining γ cerium starts to change to α cerium when cooled to –172 °C, and the transformation is complete at –269 °C. α Cerium has a density of 8.16; δ cerium exists above 726 °C. At atmospheric pressure, liquid cerium is more dense than its solid form at the melting point
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