Calcium (Element # 20) 3 : 無料・フリー素材/写真
Calcium (Element # 20) 3 / 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 | Calcium (Ca) is # 20 on the Periodic Table of Elements. Elemental calcium is a silvery-gray metal. It is one of the most common elements in Earth's crust and occurs in many minerals (e.g., calcite and plagioclase feldspar) and rocks (e.g., limestone, marble, and anorthosite).Twenty-six isotopes of calcium are known - seven occur naturally. Calcium-40 is the most common variety. Calcium-41 (= radioactive), calcium-42, calcium-43, calcium-44, calcium-46, and calcium-48 (= barely radioactive) occur in small to trace amounts only.-----------------------------Info. at:en.wikipedia.org/wiki/Calciumanden.wikipedia.org/wiki/Isotopes_of_calciumandwww.flickr.com/photos/jsjgeology/albums/72157651876454987 |
| 撮影日 | 2024-09-28 14:44:18 |
| 撮影者 | James St. John |
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