Selenium (Element # 34) : 無料・フリー素材/写真
Selenium (Element # 34) / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Selenium (Se) is # 34 on the Periodic Table of Elements. Elemental selenium is a nonmetal that varies in its appearance, from gray to red to black. Native selenium does occur, scarcely, as a mineral.Thirty-five isotopes of selenium are known - seven occur naturally. About 50% of Se is selenium-80. About 24% is selenium-78. Selenium 74, selenium-76, selenium-77, and selenium-82 occur in minor to small amounts. Selenium-79 is radioactive and occurs in trace amounts only.-----------------------------Info. at:en.wikipedia.org/wiki/Seleniumanden.wikipedia.org/wiki/Isotopes_of_seleniumandwww.flickr.com/photos/jsjgeology/albums/72157650293000514/ |
| 撮影日 | 2024-09-28 12:35:40 |
| 撮影者 | James St. John |
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