The minimum amount of energy required to remove the most loosely bo...
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
\( \mathrm{P} \) first ionisation energy or ionisation enthalpy (IE \( \left.{ }_{1}\right) \) of
W the element. The energy required to remove the second electron from the monvalent cation is called second ionisation enthalpy \( \left(\mathrm{IE}_{2}\right) \). Similarly, we have third, fourth ..... ionistion 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.
In a group, the ionisation energy decreases from top to bottom. In a period, the value of ionisation energy increases from left to right which breaks where atoms have somewhat stable configurations.
The electronic configurations of some neutral elements are given below -
(a) \( 1 s^{2}, 2 s^{2} \)
(b) \( 1 s^{2}, 2 s^{2} 2 p^{1} \)
(c) \( 1 s^{2}, 2 s^{1} \)
(d) \( 1 s^{2}, 2 s^{2} 2 p^{3} \)
Which of these electronic confugarations would be expected to have highest second ionisation energy \( \left(\mathrm{IE}_{2}\right) \)
(A) (a)
(B) (b)
(C) (c)
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