The table gives information about four elements, W, X, Y and Z.
| Element | Melting point / ∘C^\circ\mathrm{C}∘C | Density / g cm−3\mathrm{g\,cm^{-3}}gcm−3 | Formula of chloride | Reaction with cold water |
|---|---|---|---|---|
| W | 98 | 0.97 | WCl | fizzes rapidly and floats |
| X | 1538 | 7.87 | XCl3\mathrm{XCl_{3}}XCl3 | no visible reaction |
| Y | 842 | 1.55 | YCl2\mathrm{YCl_{2}}YCl2 | fizzes steadily and sinks |
| Z | 39 | 1.53 | ZCl | reacts explosively and sinks |
Which elements are in group 1?
W and Z only
W only
W and Y only
W, Y and Z only
75 exam-style questions on Edexcel GCSE Chemistry 7.1 Group 1, covering 7.1.1 Classifying elements by group in the periodic table and 7.1.2 Properties and reactions of the alkali metals. Each one has a worked solution and a mark scheme showing where the marks go.