AP Chemistry
1.8 Valence Electrons and Ionic Compounds
1.7 Periodic Trends
1.5 Atomic Structure and Electron Configuration
The first five successive ionization energies for an unknown Period 4 main-group metal, \(M\), are provided in the table below.
A sample of pure element \(M\) is heated in the presence of excess selenium, \(\text{Se}\) (atomic number \(34\)), to produce a stable binary ionic compound. Based on the ionization energy data and the electron configuration of selenium, which of the following is the predicted chemical formula and justification for the compound formed?
| Ionization step | Ionization energy (\(\text{kJ/mol}\)) |
|---|---|
| First (\(IE_1\)) | \(579\) |
| Second (\(IE_2\)) | \(1{,}979\) |
| Third (\(IE_3\)) | \(2{,}963\) |
| Fourth (\(IE_4\)) | \(6{,}200\) |
| Fifth (\(IE_5\)) | \(8{,}700\) |
A sample of pure element \(M\) is heated in the presence of excess selenium, \(\text{Se}\) (atomic number \(34\)), to produce a stable binary ionic compound. Based on the ionization energy data and the electron configuration of selenium, which of the following is the predicted chemical formula and justification for the compound formed?
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