This exam focus covers Exam Focus 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 11 of 13 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
🎯 Exam Focus
Frequently Examined
The development of the periodic table is a favourite topic for 4-6 mark extended writing questions because it tests understanding of how science progresses. Examiners specifically want: a description of early attempts (Döbereiner/Newlands) and their limitations; Mendeleev's three key improvements (gaps, predictions, swaps); and the modern change to ordering by atomic number. Higher tier questions may ask why Mendeleev's predictions were accepted as evidence that his table was correct.
Edexcel 1CH0: Examined in Paper 1 (1CH0/1). Edexcel questions on this topic typically ask students to evaluate Newlands' and Mendeleev's contributions, explain why Mendeleev left gaps, and describe how the discovery of protons led to ordering by atomic number. "Evaluate" questions worth 4–6 marks are common. In Edexcel-style questions, the command word "Suggest" appears frequently — use your chemistry knowledge to apply to an unfamiliar context.
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.