Find the number of processes are exothermic in nature.
(1) $N \to N^{-}$ (2) $O^{-} \to O^{2 -}$ (3) $P \to P^{-}$
(4) $N^{-} \to N$ (5) $S \to S^{-}$

Question

Find the number of processes are exothermic in nature. (1) N → N − (2) O − → O 2 − (3) P → P − (4) N − → N (5) S → S −

TestHub · Accepted Answer

Exothermic → energy released

Endothermic → energy absorbed

N → N⁻

Nitrogen has half-filled stability (2p³).

Adding an electron breaks stability, so energy is absorbed.

Endothermic

O⁻ → O²⁻

O⁻ + e⁻ → O²⁻

Adding an electron to an already negative ion results in strong repulsion.

Energy is absorbed.

Endothermic

P → P⁻

Normal atom gaining an electron

Energy released

Exothermic

N⁻ → N (electron removal) is endothermic.

S → S⁻

Electron gain

Energy released

Exothermic

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