Selenium, Se, is in Group 6 of the Periodic Table.
Which prediction about selenium is most likely to be correct?
It forms Se2+\mathrm{Se^{2+}}Se2+ ions when it reacts with sodium.
It is a good conductor of electricity when solid.
It forms an oxide that dissolves to make an alkaline solution.
It forms Se2−\mathrm{Se^{2-}}Se2− ions when it reacts with sodium.
60 exam-style questions on OCR GCSE Chemistry 4.1 Predicting chemical reactions, covering 4.1.1 Properties and trends in Groups 1, 7 and 0, 4.1.2 Properties of the transition metals, 4.1.3 Reactivity predicted from position in the Periodic Table, and 4.1.4 Reactivity of metals and the reactivity series. Each one has a worked solution and a mark scheme showing where the marks go.