Consider the following reactions : (i) O(g) + e- - O-(g), \Delta H1 (ii) F(g) + e- - F-(g), \Delta H2 (iii) Cl(g) + e- - Cl-(g), \Delta H3 (iv) O-(g) + e- - O2-(g), \Delta H4. Then according to gi

Question

Consider the following reactions : (i) O(g) + e- -> O-(g), \Delta H1 (ii) F(g) + e- -> F-(g), \Delta H2 (iii) Cl(g) + e- -> Cl-(g), \Delta H3 (iv) O-(g) + e- -> O2-(g), \Delta H4. Then according to given information the correct statement is/are:

Prashant Kotian · Accepted Answer

Correct answer: A,B,C. Step 1: Note that Li+, Be2+, and B3+ are isoelectronic species, each possessing exactly 2 electrons. Step 2: For isoelectronic species, the ionic radius decreases as the atomic number (nuclear charge) increases, because a stronger nucleus pulls the same number of electrons more tightly. Step 3: The atomic numbers are Li (3), Be (4), and B (5). Therefore, the size order is Li+ > Be2+ > B3+, matching option (d).

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