Before germanium was discovered, Mendeleev used its expected position in the Periodic Table to predict some of its properties.
| Property | Mendeleev's prediction | Measured for germanium after its discovery |
|---|---|---|
| Relative atomic mass | about 72 | 72.6 |
| Appearance of oxide | white | white |
Evaluate how strongly the data support Mendeleev's method of arranging elements.
Explain why ordering elements by atomic number gives a more useful Periodic Table than ordering them strictly by relative atomic mass.
122 exam-style questions on OCR GCSE Chemistry 2.2 Bonding, covering 2.2.1 Metals, non-metals and the Periodic Table, 2.2.2 Types of chemical bonding and dot and cross diagrams, 2.2.3 Limitations of bonding models, and 2.2.4 Reactivity, atomic number and the modern Periodic Table. Each one has a worked solution and a mark scheme showing where the marks go.