This is the general term used for elements with a relatively high electronegativity. It is the opposite of electropositive elements. In the periodic table, the elements in group 17, i.e. the halogen elements, are the most electropositive, with fluorine and chlorine being the most representative electropositive elements. Other examples include oxygen and sulfur in group 16, and nitrogen in group 15. When an atom of an electropositive element bonds with an atom of another element, the ionic bond element is large if the other element is an electropositive element, and the covalent bond element is large if the other element is relatively electropositive. When an ion forms, it often becomes an anion. [Nakahara Katsunori] Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
電気陰性度が比較的大きい元素を一般にこのようによんでいる。陽性元素に対する語。周期表中では17族元素、すなわちハロゲン元素がもっとも陰性が強く、フッ素、塩素などはなかでも代表的な陰性元素である。16族元素の酸素、硫黄(いおう)、15族元素の窒素などもそうである。陰性元素の原子が、他の元素の原子と結合するとき、相手が陽性元素ならばイオン結合的要素が大きく、比較的陰性の元素ならば共有結合的要素が大きくなる。イオンとなるときは陰イオンとなることが多い。 [中原勝儼] 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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