Prout's hypothesis

Japanese: プラウトの仮説（英語表記）Prout's hypothesis

In 1815, Prout proposed the hypothesis that "the building block of all atoms is the hydrogen atom." However, because there are elements with odd atomic weights, such as chlorine, this hypothesis was dismissed as incorrect and was left unadjusted. However, after the discovery of isotopes, if this "hydrogen atom" is replaced with a "nucleon" (= protons plus neutrons), this expression became perfectly accurate (however, it is still referred to as a "hypothesis").

Source: Asakura Publishing Dictionary of Laws Information

Japanese:

1815年にプラウトが提案した，「すべての原子の構成単位は水素原子である」という仮説．だが，塩素のように中途半端な原子量をもつものがあるため，誤りとして一蹴され，葬られたままであったが，アイソトープの発見後，この「水素原子」を「核子」（＝陽子プラス中性子）と置き換えればまさに正鵠を射た表現であることになった（しかし相変わらず「仮説」と呼ばれるままである）．

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