Question

Out of I, Fe, H, and Cl, what would be the pair of species showing the minimum and maximum IP?
(A) H, Fe
(B) I, Cl
(C) Fe, H
(D) I, H

Answer 1

Hint : Ionization energy is the amount of energy used to remove an electron from an enclosed, gaseous atom in the ground electronic state, resulting in a cation. H (g) → H⁺ (g) + e⁻. The sum of energy needed for all of the atoms in a mole to sacrifice one electron is normally represented in kJ/mol.

Complete Step By Step Answer:
Ionization energy is the amount of energy used to remove an electron from an enclosed, gaseous atom in the ground electronic state, resulting in a cation. H (g) → H⁺ (g) + e⁻. The sum of energy needed for all of the atoms in a mole to sacrifice one electron is normally represented in kJ/mol.
When we go through the groups, the ionisation energy decreases. Across the periodic table, ionisation energy rises from left to right.
Fe has the least electronegativity or electropositivity, the metal (Fe) has the smallest IP (Maximum tendency to give out electrons to attain chemical stability, as per its electronic configuration.) Furthermore, since the atomic size of Fe is much larger, removing an electron from its neutral atom is very easy. As a result, the IP is the smallest.
While both of the other three atoms are electronegative in nature, hydrogen is at the top of the electronegativity series, even after chlorine, which means that removing an electron from a hydrogen atom is much more difficult due to its small atomic scale and high electronegativity.
Hence, option C is correct.

Note :
While both of the other three atoms are electronegative in nature, hydrogen is at the top of the electronegativity series, even after chlorine, which means that removing an electron from a hydrogen atom is much more difficult due to its small atomic scale and high electronegativity.