what was johann dobereiners contribution to the development of the periodic table? he arranged the elements…

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

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

Answer

Brief Explanations:

Johann Dobereiner identified groups of three elements (triads) with similar chemical properties. Arranging by atomic mass was done by others like Newlands and Mendeleev, and arranging by atomic number was by Moseley. Organizing into four - groups is not his contribution.

Answer:

He identified triads of elements that had similar properties.