One success of johann döbereiner's law of triads was that it organized most of the known elements into three-element groups based on similarities in their properties. (points : 2)
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True.

Explanation:

In 1824, the German chemist Johann Dobereiner, when analyzing the chemical elements calcium (Ca), strontium (Sr) and barium (Ba), noticed a simple relationship between their atomic masses: the mass of the strontium atom was very close to mass average of the other two elements. This observation was named the Triads of Chemical Elements and thus was born the law of the triads of Johann Döbereiner.

This law argued that elements with similar properties, ie, which reacted similarly with other elements, were organized in groups of three.

the product of the pressure and volume is also constant