🎯 Common Question Types:
- Explain limitations of Newlands' octaves (2-3 marks)
- Describe how Mendeleev's table differed from earlier attempts (3-4 marks)
- Explain how Mendeleev's predictions provided evidence for his table (3 marks)
- State why the modern table uses atomic number, not atomic mass (2 marks)
📝 Key Command Words:
- Describe: Give the key features — gaps, predictions, swaps
- Explain: Say WHY gaps/predictions mattered
- Compare: Contrast Newlands and Mendeleev explicitly
- Evaluate: Comment on the strengths and limitations of each approach
⚠️ Common Mistakes to Avoid:
- Saying Mendeleev was first — Döbereiner and Newlands came before
- Forgetting that Mendeleev swapped some elements' order
- Not explaining that predictions being confirmed provided evidence
- Confusing atomic mass (old method) with atomic number (modern method)
This exam tips covers Exam Tips — Development of the Periodic Table within Development of Periodic Table for GCSE Chemistry. Revise Development of Periodic Table in Atomic Structure for GCSE Chemistry with 20 exam-style questions and 21 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 12 of 13 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Practice questions for Development of Periodic Table
John Newlands proposed the Law of Octaves in 1866. What did he notice about the elements?
Give two reasons why Newlands' Law of Octaves was not accepted by the scientific community at the time.
Quick recall flashcards
When were noble gases discovered?
1890s — added as Group 0
How is the modern table arranged?
By atomic number (protons), not atomic weight