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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Mattauch isobar rule ： ウィキペディア英語版 Mattauch isobar rule The Mattauch isobar rule, formulated by Josef Mattauch in 1934, states that if two adjacent elements on the periodic table have isotopes of the same mass number, one of these isotopes must be radioactive.〔 Two nuclides that have the same mass number (isobars) can both be stable only if their atomic numbers differ by more than one. However, this rule cannot make predictions on the half-lives of these radioisotopes.〔 ==Technetium and promethium== A consequence of this rule is that technetium and promethium both have no stable isotopes as each of the elements just before and just after these two unstable elements on the periodic table (molybdenum and ruthenium, and neodymium and samarium, respectively) have a stable isotope for each mass number for the range in which the isotopes of the unstable elements usually would be stable to beta decay.〔〔 These ranges can be calculated using the liquid drop model (for example the stability of technetium isotopes). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mattauch isobar rule」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.