A student concludes: "Every element that conducts electricity when solid is a metal."
The table shows data for 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) | Conducts electricity when solid | Effect of hammering |
|---|---|---|---|---|
| W | 98 | 0.97 | yes | flattens |
| X | 115 | 2.07 | no | shatters |
| Y | 1538 | 7.87 | yes | flattens |
| Z | above 3600 | 2.26 | yes | crumbles |
Which element provides evidence that the student's conclusion is wrong?
W
X
Y
Z
48 exam-style questions on Edexcel GCSE Chemistry 2.5 Types of substance, covering 2.5.1 Classifying substances by structure and bonding, 2.5.2 Properties of ionic and simple molecular substances, 2.5.3 Giant covalent structures: diamond and graphite, 2.5.4 Fullerenes, graphene and simple polymers, 2.5.5 Properties of metals and non-metals, and 2.5.6 Limitations of bonding models and representations. Each one has a worked solution and a mark scheme showing where the marks go.