Which of the following conversion is exothermic? (a) \( \mathrm{Na} \longrightarrow \mathrm{Na}^...

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Which of the following conversion is exothermic?
(a) \( \mathrm{Na} \longrightarrow \mathrm{Na}^{+} \)
(b) \( \mathrm{Li} \longrightarrow \mathrm{Li}^{-} \)
(c) \( \mathrm{N} \longrightarrow \mathrm{N}^{-} \)
(d) \( \mathrm{O} \longrightarrow \mathrm{O}^{2-} \)
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