d and f BLOCK ELEMENTS

What is the consequence of the Lanthanoid contraction on the atomic radii of 5d series elements compared to 4d series elements?

• The radii of 5d elements become much larger than 4d elements
• The radii of 5d elements become much smaller than 4d elements
• The radii of 5d elements become nearly equal to 4d elements
• The radii follow no predictable pattern

How does the strength of interatomic interaction relate to the number of valence electrons in transition metals?

• Fewer valence electrons lead to stronger interactions
• More valence electrons lead to stronger interactions
• It is independent of the number of valence electrons
• It depends only on the specific element

Which statement best describes the general trend of enthalpy of atomisation across the transition elements within a period?

• It generally decreases with more valence electrons
• It remains constant regardless of valence electrons
• It generally increases with more valence electrons
• It fluctuates randomly

What is the effect of the poor shielding by d electrons on the atomic/ionic radius trend across a series?

• It causes the radius to increase
• It causes the radius to remain constant
• It causes the radius to decrease
• It has no effect

Which series shows an atomic radius that is virtually the same as the corresponding element in the second series?

• First (3d) series
• Second (4d) series
• Third (5d) series
• All series are the same