Answer: In an early attempt to organize the elements into a nice array, German chemist Johann pointed out in 1817 that many of the known elements could be arranged by their similarities into groups of three, which he called triad
Explanation: the answer is the explanation
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Answer: In an early attempt to organize the elements into a nice array, German chemist Johann pointed out in 1817 that many of the known elements could be arranged by their similarities into groups of three, which he called triad
Explanation: the answer is the explanation