what was johann dobereiner’s contribution to the development of the periodic table?\nhe arranged the…

what was johann dobereiner’s contribution to the development of the periodic table?\nhe arranged the elements according to increasing atomic mass.\nhe arranged the elements according to increasing atomic number.\nhe identified triads of elements that had similar properties.\nhe organized elements into four groups based on their properties.

what was johann dobereiner’s contribution to the development of the periodic table?\nhe arranged the elements according to increasing atomic mass.\nhe arranged the elements according to increasing atomic number.\nhe identified triads of elements that had similar properties.\nhe organized elements into four groups based on their properties.

Answer

Brief Explanations:

Johann Dobereiner identified groups of three elements (triads) with similar chemical properties. For example, the lithium - sodium - potassium triad. His work was an early step in the organization of elements. Arranging by atomic mass was more associated with John Newlands and Dmitri Mendeleev, arranging by atomic number was done later with the discovery of the nucleus, and organizing into four groups based on properties is not his contribution.

Answer:

He identified triads of elements that had similar properties.