The table shows the melting points of four Group 1 elements.
| Element | Melting point (∘C^\circ\mathrm{C}∘C) |
|---|---|
| Lithium | 181 |
| Sodium | 98 |
| Potassium | 63 |
| Rubidium | 39 |
Caesium is below rubidium in Group 1.
Statement 1: The melting point of caesium is lower than 39 ∘C39\,^\circ\mathrm{C}39∘C.
Statement 2: Caesium would be a liquid at 45 ∘C45\,^\circ\mathrm{C}45∘C.
Statement 3: Caesium reacts less vigorously with water than rubidium.
Statement 4: Caesium forms ions with a charge of 1+.
Which predictions are most likely to be correct?
1 and 4 only
1, 2 and 4 only
2 and 3 only
1, 2, 3 and 4
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.