The minimum amount of energy required to remove the most loosely bound electron from an isolated...
0The minimum amount of energy required to remove the most loosely bound electron from an isolated atom in the gaseous state is known as ionisation energy or first ionisation energy or ionisation enthalpy \( \left(I E_{1}\right) \) of the element.
The energy required to remove the second electron from the monovalent cation is called second ionisation enthalpy \( \left(I E_{2}\right) \). Similarly, we have third, fourth ........... ionisation enthalpies. The values of ionisation energy depends on a number of factors such as (i) size of the atom (ii) screening effect (iii) nuclear charge (iv) half filled and fully filled orbitals (v) shape of orbital.
In a group, the ionisation energy decreases from top to bottom. In a period, the value of ionisation energy increases from left to right with breaks where atoms have somewhat stable configurations.
Compared to the second ionisation energy \( \left(I E_{2}\right) \) of an atom, the third ionisation energy \( \left(I E_{3}\right) \) is:
(A) the same
(B) greater
(C) smaller
(D) half
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