John Newlands proposed that elements be classified into _____, a group of seven elements corresponding to the horizontal rows in the main group elements.

Name: John Newlands proposed that elements be classified into _____, a group of seven elements corresponding to the horizontal rows in the main group elements.
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John Newlands proposed the Law of Octaves, suggesting that elements be classified into groups of seven, which he referred to as "octaves," due to their similarity to the octaves in music.

John Newlands Proposed That Elements Be Classified into _____, a Group