d and f BLOCK ELEMENTS

How did the work of these early chemists illustrate the scientific method?

• Through making discoveries based on luck
• Through accepting established theories without question
• Through working in complete isolation
• Through observation, hypothesis formation, testing, and refinement based on evidence

What distinguishes the approach of Mendeleev and Meyer from their predecessors like Dobereiner and Newlands?

• They used atomic number instead of atomic weight
• They focused only on physical properties
• They proposed a general law applicable to all elements, not just specific groups or patterns
• They ignored the work of earlier scientists

Why is it significant that Mendeleev sometimes corrected accepted atomic weights?

• It showed he was arrogant
• It proved atomic weights were unimportant
• It demonstrated the internal consistency and predictive power of his periodic system
• It indicated his table was flawed

What does the simultaneous, independent discovery of the Periodic Law by Mendeleev and Meyer suggest?

• They collaborated secretly
• One copied the other's work
• It was a lucky coincidence
• The scientific community was ready for such a unifying principle

How does the concept of periodicity explain the grouping of elements in the modern Periodic Table?

• Elements are grouped by alphabetical order
• Elements are grouped by atomic weight alone
• Elements in the same horizontal row have identical properties
• Elements in the same vertical column (group) have similar properties due to recurring outer electron configurations