Exam (elaborations)
GCSE CHEMISTRY 8462/1 H -Higher Tier Paper JUNE 2019 Exam Questions
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0 1 This question is about the periodic table. In the 19th century, some scientists tried to classify the elements by arranging them in order of their atomic weights. Figure 1 shows the periodic table Mendeleev produced in 1869. His periodic table was more widely accepted than previous version...
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