Analyzing the vertical group trends in the d-block, it is observed that the first ionization energies () of the 5d transition series are significantly higher than those of the 3d and 4d series. What i

Question

Analyzing the vertical group trends in the d-block, it is observed that the first ionization energies ($IE_1$) of the 5d transition series are significantly higher than those of the 3d and 4d series. What is the primary cause?

Prashant Kotian · Accepted Answer

Correct answer: C. Typically, drops down a group. However, in the d-block, the trend dominates because the highly diffuse electrons are terrible shields. The resulting spike in Effective Nuclear Charge holds the outer electrons extremely tightly.

💡 Solution & Explanation

Practice 22,000+ questions like this