6 Questions
How did Dobereiner arrange elements in his triads?
In increasing order of atomic weights
What was the flaw found in Newland's method of arranging elements?
Repetition of elements
What did Mendeleeff's Periodic Table fail to justify the position of?
Rare earth elements
What was Moseley's key improvement over Mendeleeff's Periodic Table?
Classification based on atomic numbers
In Dobereiner's triads, what was the relationship between the atomic weight of the middle element and the other two?
Equal to the average
What was the critical flaw of Newland's arrangement method regarding undiscovered elements?
No space left for hypothetical elements
Learn about the classification of elements by early chemists like Dobereiner and Newland. Explore how elements were grouped based on valency, metallic & non-metallic character, and atomic weights. Understand the limitations of these early classification methods.
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