Lesson Plan

• Describe how atomic radius, ionisation energy and electronegativity vary across a period and down a group.
• Explain the relationship between periodic trends and the type of bonding (metallic, covalent, ionic).
• Predict physical properties (melting point, density) and chemical reactivity of elements using periodic trends.
• Apply a systematic checklist to solve A‑Level exam questions on periodicity.

• Projector and screen
• Periodic table poster or large chart
• Worksheet with trend tables and practice questions
• Interactive periodic‑table software (or tablets)
• Element cards for group activity
• Scientific calculators

Begin with a quick visual of the periodic table and ask students to guess why elements in the same column behave similarly. Review prior knowledge of atomic structure and the concept of effective nuclear charge. State that by the end of the lesson they will be able to predict bonding types, physical properties and reactivity using periodic trends.

1. Do‑now (5'): Fill a short table of atomic radius, IE and EN for period 2 elements; teacher circulates to check understanding.
2. Mini‑lecture (10'): Explain systematic trends in atomic structure with diagrams and sample calculations.
3. Guided practice (12'): Solve problems predicting bonding type (metallic, covalent, ionic) from group/period information.
4. Interactive activity (10'): Use the periodic‑table software to match elements to physical‑property trends (melting point, density).
5. Consolidation (8'): Small‑group discussion applying the exam‑question checklist to a past A‑Level question.
6. Exit ticket (5'): Write one prediction about an element’s reactivity and justify it using a specific trend.

Recap the key trends and how they inform predictions of bonding, properties and reactivity. Collect the exit tickets to gauge understanding and assign the worksheet on trend analysis as homework, encouraging students to complete the textbook’s end‑of‑chapter questions.