出典:Wiktionary
出典:『Wiktionary』 (2026/04/24 23:21 UTC 版)
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| Mg Atomic number 12 magnesium |
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| English Wikipedia article on Magnesium |
From New Latin magnēsium, from Ancient Greek μαγνησία (magnēsía), after Μαγνησία (Magnēsía, “Magnesia”), a region in Thessaly. Coined by British chemist Humphry Davy, as a modification of his original suggestion, magnium.
magnesium (uncountable)
magnēsium
| Chemical element | ||||||||
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| Mg Atomic number 12 magnesium |
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Substantivization of the neuter form of magnēsius (“of or pertaining to the region of Magnesia”).
magnēsium n (genitive magnēsiī); second declension
出典:Wikipedia
出典:『Wikipedia』 (2011/06/28 18:05 UTC 版)
Magnesium (
/mæɡˈniːziəm/ mag-nee-zee-əm) is a chemical element with the symbol Mg, atomic number 12 and common oxidation number +2. It is an alkaline earth metal and the seventh most abundant element in the Earth's crust, where it constitutes about 2% by mass, and ninth in the known Universe as a whole. This preponderance of magnesium is related to the fact that it is easily built up in supernova stars from a sequential addition of three helium nuclei to carbon (which in turn is made from three helium nuclei). Due to magnesium ion's high solubility in water, it is the third most abundant element dissolved in seawater.
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