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- The third ionization enthalpy is minimum for: Option: 1 MnOption: 2 Co</di
- #Chemistry
- #Joint Entrance Examination Main
- #JEE Main
- #Engineering
- #Classification of Elements and Periodic table
The third ionization enthalpy is minimum for:
Mn
Co
Ni
Fe
Answers (1)
Importance of Ionisation Enthalpy
Ionisation enthalpy is an important factor for determining the nature of an element. The elements with low ionisation enthalpies are metals while the elements with higher ionisation enthalpies are non-metals.
The stability of oxidation states of an element can also be determined on the basis of the value of ionisation enthalpies.
(i) When the difference between two successive ionisation enthalpies for an atom is approximately 965 - 1450kJ/mol or less, then higher oxidation state will be more stable.
For example, Li has IE1 = 520kJ/mol and IE2 = 7298.1kJ/mol.
Thus, IE2 - IE1 = (7298.1 - 520.3)
= 6777.8kJ/mol
Therefore, Li+ or first oxidation state of Li is more stable.
(ii) When the difference between two successive ionisation enthalpies for an atom is higher than 1450kJ/mol, then lower oxidation state will be more stable.
For example, Ca has IE1 = 589.8kJ/mol and IE2 = 1145.4kJ/mol.
Thus, IE2 - IE1 = (1145.4 - 589.8)
= 555.6kJ/mol
Therefore, Ca2+ or second oxidation state of Ca is more stable.
-
The third ionisation potential data for the given element is given below:
Co3+ - 3237
Mn3+ - 3258
Fe3+ - 2967
Ni3+ - 3400
The electronic configuration of Fe2+ is [Ar]3d6. Thus it is easier to remove one electron to get [Ar]3d5 electronic configuration as it is half-filled and thus it is stable.
Therefore, Option(4) is correct.
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