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

Poor shielding of nuclear charge by d or f-orbital elements is respons

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

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