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(a) Answer the following questions:
(i) Which element of the first transition series has highest second ionization enthalpy?
(ii) Which element of the first transition series has highest third ionization enthalpy?
(iii) Which element of the first transition series has lowest enthalpy of atomization?
(b) Identify the metal and justify your answer:
(i) Carbonyl M(CO)_{5} (ii) MO_{3}F

Answers (1)

(a)

(i)Copper has an electronic configuration 3d^{10}4s^{1} & the second electron, which has to be removed from a fully filled d-orbital leads to a very high ionization enthalpy.

(ii) Zinc has an electronic configuration of 3d^{10}4s^{2} & the third electron, which has to be removed from a fully filled d-orbital leads to a very high ionization enthalpy.
(iii) With no unpaired electrons, Zinc has the lowest energy of atomization

(b)

(i) Fe(EAN\; rule)

(ii) Mn (oxidation state of +7)

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