出典:Wiktionary
出典:『Wiktionary』 (2026/04/24 23:21 UTC 版)
The sense of "safeguard" comes from Latin Palladium (the image of Pallas that protected Troy), from Ancient Greek Παλλάδιον (Palládion), from Παλλάς (Pallás), an epithet used before Athena.
The element was named after Pallas, an asteroid that had been discovered two years before the element.
| Chemical element |
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| Pd Atomic number 46 palladium |
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| Previous: ← rhodium (Rh) |
| Next: silver (Ag) → |
| English Wikipedia article on Palladium |
palladium (countable and uncountable, plural palladiums)
| Chemical element |
|---|
| Pd Atomic number 46 palladium |
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| Previous: ← rhodium (Rh) |
| Next: argentum (Ag) → |
From Ancient Greek παλλάδιον (palládion), neuter of παλλάδιος (palládios), Παλλάς (Pallás, “of Pallas”). See Pallas.
palladium n (genitive palladiī); second declension
出典:Wikipedia
出典:『Wikipedia』 (2011/07/14 08:01 UTC 版)
Palladium (
/pəˈleɪdiəm/ pə-lay-dee-əm) is a chemical element with the chemical symbol Pd and an atomic number of 46. It is a rare and lustrous silvery-white metal and was discovered in 1803 by William Hyde Wollaston. He named it after the asteroid Pallas, which was itself named after the epithet of the Greek goddess Athena, acquired by her when she slew Pallas. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them.
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