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- In the history of the periodic table, Döbereiner's triads were an early attempt to sort the elements into some logical order and sets based on their physical properties. They are analogous to the groups (columns) on the modern periodic table. 53 elements were known at his time. In 1817, a letter by reported Johann Wolfgang Döbereiner's observations of the alkaline earths; namely, that strontium had properties that were intermediate to those of calcium and barium. By 1829, Döbereiner had found other groups of three elements (hence "triads") whose physical properties were similarly related. He also noted that some quantifiable properties of elements (e.g. atomic weight and density) in a triad followed a trend whereby the value of the middle element in the triad would be exactly or nearly predicted by taking the arithmetic mean of values for that property of the other two elements. These are as follows: Limitations: All the known elements could not be arranged in the form of triads. For very low-mass or very high mass elements, the Döbereiner’s triads are not applicable. Take the example of F (Fluorine), Cl (Chlorine), and Br (Bromine). The atomic mass of Cl is not an arithmetic mean of the atomic masses of F and Br. As the techniques for accurately measuring atomic masses improved, the Döbereiner’s triad was found to fail to remain strictly valid. (en)
- Faoi 1829, i stair an tábla pheiriadaigh, luath iarracht ab ea triaid Döbereiner na dúile a shórtáil in ord loighciúil éigin de réir a n-airíonna fisiciúla. Sa bhliain 1817, thuairiscigh litir faoi bharúlacha ar na ; is é sin, go raibh airíonna ag an strointiam a bhí idirmheánach dóibh siúd a bhí ag cailciam agus bairiam. Faoi 1829, bhí grúpaí eile de thrí dhúil (mar sin "triaid") aimsithe ag Döbereiner a raibh baint chéanna ag a n-airíonna fisiciúla leo. Thug sé faoi deara freisin gur lean roinnt airíonna inchainníochtaithe de dhúile (m.sh. meáchan adamhach agus dlús) treocht trína ndéanfaí luach na dúile lárnaí sa triad a thuar go díreach nó beagnach trí mheán uimhríochtúil luachanna don mhaoin sin den dá dhúil eile a thógáil. (ga)
- 되베라이너의 삼원소는 에서 물리적 특성에 따라 원소를 논리적으로 배열하고자 한 초기의 시도이다. 1817년의 편지에서는 요한 볼프강 되베라이너가 알칼리 토금속에서 스트론튬이 칼슘과 바륨의 중간 정도의 성질을 가지고 있음을 관찰하였다고 기록하고 있다. 1829년에 되베라이너는 물리적 특성이 유사하게 관련되어 있는 세개의 원소(즉 "삼원소") 그룹을 발견했다. 그는 삼원소내 원소에서 일부 정량적 성질(예 : 원자량과 밀도)이 어떤 경향을 따르고 있고, 삼원소 중에서 가운데 원소에 대한 값을 다른 두개 원소에 대한 값의 평균값을 취하는 방법으로 정확하게 또는 거의 유사하게 예측할 수 있다는 점을 밝혔다. (ko)
- Triady Döbereinera – rodzaj klasyfikacji pierwiastków chemicznych wprowadzony w 1829 roku przez Johanna Wolfganga Döbereinera. Triadą nazwał on dowolne trzy pierwiastki mające trzy kolejne masy atomowe (w czasach Döbereinera to były średnie masy molowe pierwiastków) o takiej własności, że masa środkowego z nich jest średnią arytmetyczną mas atomowych skrajnych. (pl)
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- 6145 (xsd:nonNegativeInteger)
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- December 2013 (en)
- March 2018 (en)
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- Need to sync the masses and elements used here with those used in the actual publications not later modern refinements. (en)
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- Faoi 1829, i stair an tábla pheiriadaigh, luath iarracht ab ea triaid Döbereiner na dúile a shórtáil in ord loighciúil éigin de réir a n-airíonna fisiciúla. Sa bhliain 1817, thuairiscigh litir faoi bharúlacha ar na ; is é sin, go raibh airíonna ag an strointiam a bhí idirmheánach dóibh siúd a bhí ag cailciam agus bairiam. Faoi 1829, bhí grúpaí eile de thrí dhúil (mar sin "triaid") aimsithe ag Döbereiner a raibh baint chéanna ag a n-airíonna fisiciúla leo. Thug sé faoi deara freisin gur lean roinnt airíonna inchainníochtaithe de dhúile (m.sh. meáchan adamhach agus dlús) treocht trína ndéanfaí luach na dúile lárnaí sa triad a thuar go díreach nó beagnach trí mheán uimhríochtúil luachanna don mhaoin sin den dá dhúil eile a thógáil. (ga)
- 되베라이너의 삼원소는 에서 물리적 특성에 따라 원소를 논리적으로 배열하고자 한 초기의 시도이다. 1817년의 편지에서는 요한 볼프강 되베라이너가 알칼리 토금속에서 스트론튬이 칼슘과 바륨의 중간 정도의 성질을 가지고 있음을 관찰하였다고 기록하고 있다. 1829년에 되베라이너는 물리적 특성이 유사하게 관련되어 있는 세개의 원소(즉 "삼원소") 그룹을 발견했다. 그는 삼원소내 원소에서 일부 정량적 성질(예 : 원자량과 밀도)이 어떤 경향을 따르고 있고, 삼원소 중에서 가운데 원소에 대한 값을 다른 두개 원소에 대한 값의 평균값을 취하는 방법으로 정확하게 또는 거의 유사하게 예측할 수 있다는 점을 밝혔다. (ko)
- Triady Döbereinera – rodzaj klasyfikacji pierwiastków chemicznych wprowadzony w 1829 roku przez Johanna Wolfganga Döbereinera. Triadą nazwał on dowolne trzy pierwiastki mające trzy kolejne masy atomowe (w czasach Döbereinera to były średnie masy molowe pierwiastków) o takiej własności, że masa środkowego z nich jest średnią arytmetyczną mas atomowych skrajnych. (pl)
- In the history of the periodic table, Döbereiner's triads were an early attempt to sort the elements into some logical order and sets based on their physical properties. They are analogous to the groups (columns) on the modern periodic table. 53 elements were known at his time. Limitations: (en)
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- Döbereiner's triads (en)
- Triaid Döbereiner (ga)
- 되베라이너의 삼원소 (ko)
- Triady Döbereinera (pl)
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