What are the three elements known that were classified by the Johann Dobereiner?

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Solution

Dobereiner triads:
Dobereiner placed the elements with identical properties into the same groups.
Three elements were placed in the same group. So, he called these groups ‘triads'.”
“Döbereiner showed that when the three elements in a triad were written in the order of increasing atomic masses; the atomic mass of the middle element was roughly the average of the atomic masses of the other two elements.”

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