Science lesson plan · 8th grade (Year 9 in England) · 30 minutes
Group 0: why noble gases are unreactive and how we use them
Atoms, elements and the periodic table
CCSS NGSS.HS-PS1-1England: GCSE Combined Science: Atomic structure and the periodic table (group 0)
Objective and success criteria
Students will: Group 0: why noble gases are unreactive and how we use them.
- I can answer questions on today's skill on my own, without help.
- I can explain each step and say why it works.
- I can check my answer and spot a mistake.
Before and after
Needs first: The periodic table: groups and periods
Leads to: the next skill in this area.
Materials: Periodic tables, Atom model kits, Mini whiteboards, A diagram or short video clip of the idea, Printed student sheet (below).
Warm-up · 4 min
- Quick retrieval from earlier learning (The periodic table: groups and periods). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- Which family does neon belong to? (alkali metals (group 1) / halogens (group 17, also called group 7) / noble gases (group 18, also called group 0)) → noble gases (group 18, also called group 0)Prompt: Is it a soft metal, a coloured reactive non-metal, or an unreactive gas?
- Which family does chlorine belong to? (alkali metals (group 1) / halogens (group 17, also called group 7) / noble gases (group 18, also called group 0)) → halogens (group 17, also called group 7)Prompt: Is it a soft metal, a coloured reactive non-metal, or an unreactive gas?
- Which family does iodine belong to? (alkali metals (group 1) / halogens (group 17, also called group 7) / noble gases (group 18, also called group 0)) → halogens (group 17, also called group 7)Prompt: Is it a soft metal, a coloured reactive non-metal, or an unreactive gas?
Hook · 3 min
- Show the periodic table and ask what patterns students can see before anything is explained.
- Share the objective: Group 0: why noble gases are unreactive and how we use them. Read the success criteria together.
I do: model it · 7 min
- Work through the example out loud, saying why you do each step, not just what you do.
- Example: Why are noble gases so unreactive?
- Step 1: With a stable full outer shell, noble gases do not need to lose, gain or share electrons.
- Step 2: So the answer is: Their outer electron shell is full
- Answer: Their outer electron shell is full
- Pause after each step and ask a student to say what comes next.
We do: guided practice · 6 min
- Do these together. Students try each step on whiteboards before you reveal it.
- Use the hints as prompts rather than giving the answer.
- Boiling points: helium −269 °C, neon −246 °C, argon −186 °C. What is the trend down the group? (boiling point increases / there is no pattern / boiling point stays the same / boiling point decreases) → boiling point increasesPrompt: Compare −269 with −186. Which is higher?
- The noble gases: which statement is NOT true? (Noble gases are colourless at room temperature. / Noble gases exist as single atoms. / Noble gases have eight electrons in every shell. / Helium has a full outer shell with only two electrons.) → Noble gases have eight electrons in every shell.Prompt: How many electrons are in helium's outer shell?
You do: independent practice · 7 min
- Students work on the student sheet. Circulate and check the first two answers of every student early.
- Students who finish: write a question of their own for a partner, with the answer.
The 6 questions are on the student sheet below, with answers in the key.
Exit ticket · 3 min
- Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
- Why is helium, not hydrogen, used in party balloons and airships today? (Helium is less dense than air and does not burn / Helium is denser than air / Helium is cheaper than air / Hydrogen is a noble gas) → Helium is less dense than air and does not burnPrompt: Think about safety and floating.
- Which noble gas is used for filling party balloons and airships? (helium / neon / argon) → heliumPrompt: Think about density, glowing colours and how cheap the gas is.
Watch out for
- Everyday meanings of words getting in the way of the science meaning: define key words explicitly.
- Remembering facts without the reason: ask "why?" and "what is the evidence?"
Support and stretch
Support
- Review first: The periodic table: groups and periods.
- Use concrete materials: periodic tables.
- Give the first step of each question, or a partly worked example to finish.
- Pair with a confident partner for the guided practice.
Stretch
- Explain a common mistake in writing and how to fix it.
- Write a word problem that uses today's skill, then solve a partner's.
Homework and more practice
Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-8.
Free lesson plan from eurekami.com/lesson-plan-builder