A German scientist called Johann Dobereiner put forward his law of triads
in
1817. Each of Dobereiner's
triads was a group of three elements. The appearance and reactions of the elements
in a triad were similar to each other.
Atomic masses At this time, scientists had begun to find out the relative
atomic masses of the elements. Dobereiner discovered that the relative atomic
mass of the middle element in each triad was close to the average of the relative
atomic masses of the other two elements. This gave other scientists a clue that
relative atomic masses were important when arranging the elements.
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