INCORRECT order of ionisation energy is : | TestHub

Passage / Comprehension

Amount of energy required to remove the most loosely bonded electron from an isolated gaseous atom from its ground state electronic configuration is called ionization energy. The value of ionization energy mainly depends on (i) $Z_{e ff}$ , (ii) atomic radius, and (iii) the screening effect of inner electrons. Successive ionization energies of an element always follow an increasing order.

INCORRECT order of ionisation energy is :

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Answer:

Solution:

The incorrect order is (C) $L i^{+} < O^{+}$ . $L i^{+}$ has a stable noble gas configuration ( $1 s^{2}$ ), where the electron is removed from the $n = 1$ shell, which is extremely close to the nucleus. $O^{+}$ has the configuration $1 s^{2} 2 s^{2} 2 p^{3}$ , meaning its valence electron is in the $n = 2$ shell.

Because it requires significantly more energy to remove an electron from a stable inner shell ( $n = 1$ ) than from a higher shell ( $n = 2$ ), the true order is $L i^{+} > O^{+}$ .

Chemistry - PERIODIC TABLE Question with Solution | TestHub

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