Lesson Plan

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Lesson Plan
Grade: Date: 04/03/2026
Subject: Chemistry
Lesson Topic: Group 17: properties, reactions, trends, uses
Learning Objective/s:
  • Describe the electronic configuration, valence electrons and common oxidation states of the halogens.
  • Explain periodic trends (atomic radius, electronegativity, bond energy, reduction potential, acidity) across Group 17.
  • Predict reactivity and write balanced equations for typical halogen reactions (halide formation, hydrogen halides, hydrolysis, organic halogenation).
  • Evaluate major industrial, commercial and medical applications of each halogen.
Materials Needed:
  • Projector and screen
  • Periodic‑table handouts
  • Worksheet with trend tables and reaction equations
  • Set of index‑card stations describing halogen uses
  • Clickers or online quiz tool for exit ticket
  • Whiteboard and markers
 Introduction:

Begin with a striking image of coloured halogen vapours to spark curiosity. Ask students what they already know about the “halogen” name and why these elements are so reactive. Outline today’s success criteria: students will identify trends, predict reactions and link each halogen to real‑world uses.
Lesson Structure:
  1. Do‑now (5’) – Quick quiz on electron configurations of Group 17 projected on screen; review answers.
  2. Mini‑lecture (10’) – Present diatomic nature, oxidation states and key properties using slides.
  3. Trend‑analysis activity (12’) – In pairs, fill a table of physical/chemical trends from provided data; discuss underlying reasons.
  4. Reaction demonstration (10’) – Show balanced equations for halide formation, hydrogen halides and hydrolysis; students predict products for a given metal.
  5. Organic halogenation task (8’) – Write products for free‑radical chlorination of methane and electrophilic addition to ethene.
  6. Uses carousel (8’) – Rotate through stations with cards on each halogen’s applications; record one new use per element.
  7. Check for understanding (5’) – Exit ticket: state one trend and explain how it influences halogen reactivity.
Conclusion:

Recap the six key points, emphasising how periodic trends drive reactivity and applications. Collect exit tickets and remind students to research a specific halogen‑based product for a short paragraph homework.