Question

The second and third row elements of transition metals resemble each other much more than they resemble the first row because of

• A. Lanthanoid contraction which results in almost same radii of second and third row metals
• B. Diagonal relationship between second and third row elements
• C. Similar ionization enthalpy of second and third row elements
• D. Similar oxidation states of second and third row metals.

Answer 1

Answer: (A)

Lanthanoid contraction which results in almost same radii of second and third row metals

Answer 2

Due to lanthanoid contraction, the atomic radii of second and third row transition elements is almost same. Hence, they resemble each other much more as compared to first row elements.