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Type the year or the group

Exercise and reference answers

Questions
  1. Answer
    1865
    Question
    In which year did Newlands give the Law of Octaves?
  2. Answer
    1913
    Question
    In which year did Moseley study X-ray spectra?
  3. Answer
    8
    Question
    Octaves repeat at every how many elements?
Instructions
Type the number only.

Explanation

_Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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