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This lesson covers the history of the periodic table and how it is organised, as required by AQA GCSE Combined Science Trilogy (8464, Chemistry 4.1.2). You need to understand how early attempts to classify elements led to the modern periodic table and why elements are arranged the way they are.
Before the periodic table was developed, scientists tried to organise the known elements in various ways:
Dmitri Mendeleev created the first widely accepted periodic table:
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