The Periodic Table (C. 5AB) Pre-Assessment Results Name: blake bilbrey Score


There was a tendency to observe groups of three elements (“triads”) that had similar chemical and physical properties



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There was a tendency to observe groups of three elements (“triads”) that had similar chemical and physical properties.

  • The mass of the middle element of this triad had a mass that was close to the average of the other two elements.

  • Nature tends to form groups of three elements with this pattern being true of each group.

    The Law of Triads was part of the history of building a Periodic Table of the Elements, but scientific discoveries that came after this idea emerged showed that this law illustrated an incomplete view of the elements.




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