In which of the following processes energy is absorbed?

CHEMISTRY · Single correct · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties

Problem

In which of the following processes energy is absorbed? (1) Cl+e−⟶Cl−\text{Cl} + e^- \longrightarrow \text{Cl}^- (2) O−+e−⟶O2−\text{O}^- + e^- \longrightarrow \text{O}^{2-} (3) O2−−e−⟶O−\text{O}^{2-} - e^- \longrightarrow \text{O}^- (4) Na++e−⟶Na\text{Na}^+ + e^- \longrightarrow \text{Na}

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