Question

What does the sentence " the ionisation enthalpy is numerically equal to the electron enthalpy of its uni positive cation." mean?​

Answer 1

Answer:

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⇒Atoms of same elements gain electrons while forming ionic compounds. An atom is able to gain an electron only when the electron outside the atom is attracted by its nucleus. Attraction involves the liberation of energy..

⇒The electron affinity or electron gain enthalpy of an element is defined as the energy liberated when an electron is added to its neutral gaseous atom...

⇒The energy required to remove an electron from the outermost orbit or shell of a neutral gaseous atom is called ionization enthalpy/ potential/ energy...it is expressed in kJ mol⁻¹.....Always I₁ < I₂

→The Condition required for the formation of an ionic bond between two Elements are: Two elements must be of opposite charge. An element must have its less Ionisation Enthalpy(Cation). Another element must have high negative electron gain enthalpy(Anion).

→Thus, the low ionization energy of a metal atom and high electron affinity of a non-metal atom facilitate the formation of an ionic bond between them.