Which of the following figures represents Mendeléev's Periodic Table that was published in a German journal in 1872?

The correct answer is c.

Key Points

• Mendeleev's Periodic Table, published in 1872, was one of the first comprehensive arrangements of the known elements based on their properties and atomic masses. 
• Key Features of Mendeleev's Periodic Table:
  • Groups and Periods:
    • The table was arranged into groups (columns) and periods (rows).
    • There were 8 groups (I to VIII) initially, though the main groups recognized were I to VII, with the 8th group being added later for transition elements.
    • Periods ranged from 1 to 6.
  • Gaps for Unknown Elements:
    • Mendeleev left gaps in his table for elements that had not yet been discovered, predicting their existence and properties based on periodic trends.
  • Periodic Law:
    • The elements were arranged in order of increasing atomic mass, with elements with similar properties placed in the same group.
• Figure (c) shows groups I to VIII and periods are labeled from 1 to 6. Hence the correct answer is option 1- c.