Which of the following is NOT correctly matched?

A. Element of 1st transition series with highest 2nd ionization enthalpy: Cu

B. Element of 1st transition series with the lowest atomization: Zn

C. Last element of 2nd transition series: Hg

D. Element of the 1st transition series with highest 3rd ionization enthalpy: Zn

Choose the correct answer from the options given below:

C only

The correct answer is option 2. C only ( Last element of 2nd transition series: Hg)

Transition Series:

Elements in the same period share similar chemical properties but differ in the number of protons and electrons. Transition series elements are defined by having partially filled d orbitals in their electron configuration. There are seven transition series in the periodic table, each starting with an element that does not fill the d orbitals of its previous row (d-block).

Second Transition Series:

The second transition series starts with Yttrium (Y) and ends with Cadmium (Cd).

Mercury (Hg) is part of the third transition series, which starts with Lanthanum (La) and ends with Mercury (Hg).

Mistake:

The statement in option C, "Last element of 2nd transition series: Hg," is factually incorrect because Hg belongs to the third transition series, not the second. Therefore, this is the INCORRECT match.

Other Options:

A. Element of 1st transition series with highest 2nd ionization enthalpy: Cu: This statement aligns with the trends in ionization enthalpies, as Cu's fully-filled d subshell configuration after losing the first electron makes it harder to remove the second.

B. Element of 1st transition series with the lowest atomization: Zn: While Zn's atomization enthalpy is the lowest in the first transition series, it is within the typical range.

D. Element of the 1st transition series with highest 3rd ionization enthalpy: Zn: Zn might have a high third ionization enthalpy due to removing a core electron.

Conclusion:

The inaccurate statement about Hg being the last element of the second transition series makes option 2 the incorrect match.