Final answer:
Mendeleev's table predicted undiscovered elements, while Meyer's focused on simple atomic properties and arrangements.
Explanation:
Two differences between Mendeleev's Periodic Table and Meyer's Periodic Table:
- Mendeleev's Prediction: Mendeleev's table included gaps for undiscovered elements based on their properties, like the prediction of gallium and germanium.
- Arrangement: Mendeleev arranged elements according to increasing atomic mass, while Meyer focused on simple atomic properties like atomic volume.
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