d and f BLOCK ELEMENTS Quiz

• It proved periodicity was impossible
• It confirmed atomic weights were wrong
• It highlighted the need for a more robust and flexible system
• It led to the discovery of isotopes

• The use of atomic weights
• The arrangement of elements in order
• The analogy drawn to musical octaves
• The prediction of new elements

• Dobereiner's Law of Triads
• Newlands' Law of Octaves
• The Periodic Law
• The Law of Constant Composition

• Both were immediately accepted
• Both were rejected
• Dobereiner's work was dismissed as coincidence, while Mendeleev's gained acceptance due to predictions
• Mendeleev's work was dismissed, Dobereiner's accepted

• It was mathematically incorrect
• It only worked for metals
• Its three-dimensional nature and use of geological terminology made it less accessible
• It contradicted known chemical reactions