...By examining the elemental composition of various compounds, it is possible to know how many atoms of a certain element are bonded to one atom of another element. The ratio of the number of atoms bonded in a compound is fixed because each atom has a certain number of bonds, and the number of such bonds is called the atomic valence of that atom. Since there are no atoms that bond to a single hydrogen atom more than twice, the valence of the hydrogen atom H is set to 1, and the valence of the other atoms is determined by the number of hydrogen atoms that can bond to that atom. ... *Some of the terminology that refers to "covalent bond theory" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…いろいろな化合物の元素組成を調べると,ある元素の原子1個が他の元素の原子何個と結合しているかを知ることができる。このように化合物の中で結合している原子の数の比が決まっているのは,それぞれの原子が一定数の結合のための手のようなものをもっているからで,このような手の数をその原子の原子価という。水素原子1個に対し2個以上結合する原子がないので,水素原子Hの原子価を1とし,他の原子の原子価はその原子1個と結合しうる水素原子の数で決める。… ※「共有結合理論」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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