AP Chemistry
1.8 Valence Electrons and Ionic Compounds
1.7 Periodic Trends
The first six successive ionization energies for an unknown Period 3 element, \(\text{X}\), are provided in the table below.
Which of the following correctly identifies element \(\text{X}\), predicts the chemical formula of the stable binary ionic compound formed between \(\text{X}\) and magnesium, and provides the correct justification for the large increase between \(IE_5\) and \(IE_6\)?
| Ionization step | Ionization energy (\(\text{kJ/mol}\)) |
|---|---|
| First (\(IE_1\)) | \(1{,}012\) |
| Second (\(IE_2\)) | \(1{,}907\) |
| Third (\(IE_3\)) | \(2{,}914\) |
| Fourth (\(IE_4\)) | \(4{,}964\) |
| Fifth (\(IE_5\)) | \(6{,}274\) |
| Sixth (\(IE_6\)) | \(21{,}267\) |
Which of the following correctly identifies element \(\text{X}\), predicts the chemical formula of the stable binary ionic compound formed between \(\text{X}\) and magnesium, and provides the correct justification for the large increase between \(IE_5\) and \(IE_6\)?
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