Question

In which of the given pairs, the first species is more stable than the second?
Ch- GOC (class 11)
Refer to the attached picture
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Answer 1

Answer:

Correct answer is option 'D'.

Explanation:

Na

+

and F

−

are isoelectronic species with 10 electrons each. For isoelectronic species, cation has smaller size than anion. In Na

+

, 11 protons attract 10 electrons. In F

−

, 9 protons attract 10 electrons. Hence the attraction between nucleus and valence electrons is more for Na

+

than F

−

.