Which of the following processes is endothermic? (a) \( \mathrm{S} \rightarrow \mathrm{S}^{-} \)...

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Which of the following processes is endothermic?
(a) \( \mathrm{S} \rightarrow \mathrm{S}^{-} \)
(b) \( \mathrm{S}^{-} \rightarrow \mathrm{S}^{2-} \)
(c) \( \mathrm{Na} \rightarrow \mathrm{Na}^{-} \)
(d) \( \mathrm{P} \rightarrow \mathrm{P}^{-} \)
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