What was the basis of Mendeleev's Periodic Table, and what were its limitations?
Answer (1)
Mendeleev arranged elements in order of increasing atomic weight and grouped them according to similar chemical properties.
Limitations:
- Position of Hydrogen: Could not assign a correct position to hydrogen.
- Position of Isotopes: Isotopes of an element have different atomic weights but the same chemical properties.
- Anomalous Pairs: In some pairs, the element with the higher atomic weight was placed before the element with the lower atomic weight (e.g., Argon and Potassium) to maintain similar properties in the same group.
- No explanation for periodicity: Mendeleev's table did not explain why elements showed periodicity in their properties.
- No place for Noble Gases: Noble gases were discovered after Mendeleev published his periodic table.
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