Squarecap 10

Examine the following process.

\[\mathrm{Na^- (g)} \longrightarrow \mathrm{Na(g)} + e^- \quad \Delta U = 52.8~\mathrm{kJ~mol^{-1}}\]

Choose the true statement.

1. This process gives an electron affinity for sodium.
2. Na(g) is lower in energy than Na^–(g).
3. The electron attachment energy for sodium is 52.8 kJ mol^–1