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2016-02-29T17:12:40+05:30

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In 1829, the German chemist Johann Wolfgang Döbereiner noted that there were triads of elements that showed similar chemical properties. He also noted that other properties of the elements followed trends in which the value of the middle element of the triad was in between those of the end members.
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2016-02-29T17:13:59+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
He tried to arrenge 3 elements in a group where the average of atomic masses of 1 and last element was roughly equal to the atomic mass of the middle element
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