John Newlands stated his “law of octaves”: if elements are arranged in increasing atomic weight order, those with similar properties occur after each interval of seven elements (for example, lithium and sodium, or carbon and silicon)
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Unknown title of the other two [e.g., sodium with atomic weight 23 is midway between lithium (3) and potassium (39), or bromine (80) between chlorine (35) and iodine (127)]. And in 1865, the English chemist <span>John Newlands stated his “law of octaves”: if elements are arranged in increasing atomic weight order, those with similar properties occur after each interval of seven elements (for example, lithium and sodium, or carbon and silicon), much as the notes in music. It was against this background that we meet Professor Dimitri Mendeleev at St. Petersburg, Russia, in 1865. Not satisfied with existing text books, he wrote Summary
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