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Led by Dmitri Mendeleev
Module 2 of Edexcel GCSE Chemistry. Led by Dmitri Mendeleev, who in 1869 arranged the known elements into a periodic table and predicted the existence and properties of elements not yet discovered. The student traces the table from Mendeleev's mass-ordered original through Moseley's atomic-number resolution to the modern arrangement and uses electronic configurations to predict chemical behaviour.
Led by Dmitri Mendeleev
The question
How did Mendeleev arrange the 63 elements known in 1869 into a table that not only organised existing chemistry but predicted elements that had not yet been discovered, and what does the modern atomic-number-ordered version of his table tell us about the structure of any element's atoms? The spec asks the student to describe Mendeleev's arrangement and his predictions, account for the anomalies he encountered, explain the meaning of atomic number in the modern table, describe the structure of periods and groups, identify metals and non-metals from position, predict electronic configurations for the first 20 elements, and explain the relationship between configuration and position.
Outcome
the student can describe Mendeleev's arrangement and the predictions he derived, account for his anomalies and Moseley's resolution, describe the structure of the modern periodic table, identify metals and non-metals from position, predict the electronic configuration of any element from H to Ca, and explain how configuration is determined by position. *(Edexcel 1CH0 — Topic 1, spec points 1.13–1.20)*
Sub-units