d and f BLOCK ELEMENTS

How did Mendeleev arrange the elements in his table?

• Strictly in order of increasing atomic numbers.
• In a single row based on atomic weights.
• Randomly, then grouped by similar symbols.
• In horizontal rows and vertical columns based on increasing atomic weights and similar properties.

What did Lothar Meyer's work on the periodic table resemble?

• Mendeleev's Table
• Newlands' Law of Octaves
• Dobereiner's Triads
• The Modern Periodic Table

What was the significance of the discovery of gallium and germanium in relation to Mendeleev's table?

• It proved atomic number was more important than atomic weight.
• It showed that Mendeleev's atomic weight measurements were incorrect.
• It filled the last gaps in his original table.
• Their properties matched his predictions, validating his table.

Who initiated the study of periodic relationships among elements?

• John Newlands
• Dmitri Mendeleev
• Lothar Meyer
• Johann Dobereiner

What did Mendeleev's Periodic Law state?

• The properties of the elements are a periodic function of their atomic numbers.
• Elements are arranged based on their electron configurations.
• The properties of the elements are a periodic function of their atomic weights.
• Elements are grouped according to their isotopes.