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Periodic Table: Historic perspective
- Dmitri Mendeleev (1834–1907) developed the modern periodic table.
- Argued that element properties are periodic functions of their atomic weights
- Periodic law
- When the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically.
- Elements having similar physical and chemical properties fall within a column.
- We now know that element properties are periodic functions of their atomic numbers.