Topic 1 · pp. 105–106 · Free
Topic Notes · Easy summaries with diagrams
Chapter 8 — Chapter 8 — Periodic Table and Periodicity
0 of 7 steps done ✓ (6 topics + Exercise)
Topic 1 of 6
📘Easy summary
The modern periodic table arranges elements in increasing atomic number. Properties repeat at regular intervals — periodicity. Horizontal rows are periods; vertical columns are groups. Along a period electronic configuration changes so properties change gradually; in a group outer configuration is the same so chemical properties are similar.
⭐Key points
- Mendeleev used atomic masses; Moseley used atomic numbers.
- E.G. Mazurs collected 700 versions of the periodic table.
🔬Diagram
🌿Real-life example
Li, Na, K all in group 1 behave alike.
💡Exam tip
- 'Periodic' = repeating after regular intervals.
✅Quick check
1. Modern table is based on:
2. Number of groups:
Practice this chapter
Lock it in with flashcards and exam-style MCQs.