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Under the Law of Octaves, properties repeat at every:
ASecond element
BTwelfth element
CEighth element
DFourth element
Answer & Solution
Correct answer: C. Eighth element
1. Elements were listed in order of increasing atomic weight.
2. Every eighth one resembled the first in properties.
3. The likeness recalled the octaves of music.
_Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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