Which equation correctly represents the process corresponding to the second ionization energy of sodium?
Na(g)→Na2+(g)+2e−Na(g) \rightarrow Na^{2+}(g) + 2e^-Na(g)→Na2+(g)+2e−
Na+(g)→Na2+(g)+e−Na^+(g) \rightarrow Na^{2+}(g) + e^-Na+(g)→Na2+(g)+e−
Na+(s)→Na2+(s)+e−Na^+(s) \rightarrow Na^{2+}(s) + e^-Na+(s)→Na2+(s)+e−
Na(g)→Na+(g)+e−Na(g) \rightarrow Na^+(g) + e^-Na(g)→Na+(g)+e−
