d and f BLOCK ELEMENTS

What role did the failure of Newlands' Law beyond Calcium play in the history of the Periodic Table?

• 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

What aspect of Newlands' Law of Octaves was considered unscientific by his contemporaries?

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

What does the phrase "similarities appear in physical and chemical properties at regular intervals" define?

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

How did the initial scientific reaction to Dobereiner's triads differ from the reaction to Mendeleev's table?

• 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

Why was de Chancourtois's 'Telluric Screw' model difficult for the contemporary scientific community to adopt?

• 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