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 ionisation 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

The second and third row of transition elements resemble each other more than they do with the first row of transition elements due to lanthanide contraction calmost same atomic radius because of increase in nuclear charge.