Poor shielding of nuclear charge by `d` or `f`-orbital electrons is responsible for which of the following facts?A. Atomic radius of Nb (4d -series) is comparable to Ta (5d-series)B. The 1 st ionisation enregy of copper is less than that of zinc.C. The value of electron gain enthalpy is more negative for sulphur than for oxygen.D. The 1 st ionization energy for gold is greater than that of silver.

Poor shielding of nuclear charge by `d` or `f`-orbital electrons is re

1.	Poor shielding of nuclear charge by `d` or `f`-orbital electrons is responsible for which of the following facts?A. Atomic radius of Nb (4d -series) is comparable to Ta (5d-series)B. The 1 st ionisation enregy of copper is less than that of zinc.C. The value of electron gain enthalpy is more negative for sulphur than for oxygen.D. The 1 st ionization energy for gold is greater than that of silver.
Answer» Correct Answer - A::D

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