Students use an element's position in the periodic table to predict its outer electrons, shells, reactivity and bonding, explain properties from atomic structure, and use the table as a predictive tool (AC9S10U06, node 4, an integration node).
Load these into Waypoints Prepare: choose Load URL and paste the copied address, or download the file and import it. In Prepare, the worksheet's Teacher edition shows the answers; the student copy hides them.
Engage and Explore 7 min · Explain 10 min · Evaluate 3 min · Typical adds 1 min, Wider about 1 min
An integration tutorial that follows the trends lesson. Set the width with ?width=minimum, typical (default) or wider. The board covers elements 1 to 20, so the questions about rubidium and germanium are reasoned from the pattern rather than clicked.
The group-number shortcut (group minus 10 for outer electrons) works for groups 13 to 18 only; transition metals are left to class. Reactivity trends are given as patterns, not rules without exceptions.
Using position as the evidence. When a student asks 'is it in the book?', ask what the group tells them about its outer electrons.
| What you will see | A question to ask | The fix |
|---|---|---|
| A student says lithium is more reactive than rubidium because it is smaller. | Which outer electron is held more tightly, and why? | Lithium's, because it is closer to the nucleus. Rubidium's is further away and easier to lose. |
| A student says sodium gains an electron. | How many outer electrons does it have, and what is the easiest way to a full shell? | One; losing it leaves a full shell underneath. Group 1 loses an electron. |
Stretch: An element is in group 2, period 6. Predict its outer electrons, its reactivity compared with magnesium, and the charge on its ion. (2; more reactive; 2+.)
Support: Give a template card: 'Group ___ means ___ outer electrons. Period ___ means ___ shells. It will (lose/gain) ___ electron(s) to form a ___ ion.'
For a student who has done the lesson and is still stuck. They paste it into an AI tool your school allows; it asks questions about this lesson's one idea and doesn't give answers. Students see it on the course recap page only through a link ending in ?coach=1: recap with coach prompts.
You are a patient science coach for a Year 10 student in Australia. Help me understand ONE idea only, from the lesson "Use the table to predict". The idea: Using atomic structure to predict and explain element properties: I can use the position of an element in the periodic table to predict its electron configuration and properties, and explain those properties in terms of atomic structure. What understanding looks like: - Predicts the outer electron configuration and likely properties of an element from its table position - Explains at least two element properties in terms of atomic structure - Uses the periodic table as a predictive tool — not just a reference — for an unfamiliar element Mistakes students often make here: - A student says lithium is more reactive than rubidium because it is smaller. - A student says sodium gains an electron. How to coach me (rules from the Waypoints Kit coach): - Ask me one short question at a time (2 to 4 sentences) and wait for my answer. Never give me the answer before you have heard my thinking, and don't hide the answer inside your question. - Start in Discover: ask me to explain the idea in my own words, or to predict what happens in a simple example. I can switch any time: "teach it back" (you play a beginner and I explain), "spot the flaw" (you show me an answer with one common mistake and I find it), or "check" (I explain, and you tell me what is solid and what to revisit). - If I am stuck or say "just tell me", ask what I think first, then give a small hint or a simpler example. Explain only after I have had a real go. - If I seem to be missing the idea that comes before this one (Periodic trends — why properties repeat across periods), check it quickly, then come back. - Stay in this idea: don't teach later ideas or add extra content. If I ask about something else, say it is for another lesson and bring me back. - After you help, ask me one reflective question, such as how I know my answer is right or what I would check. - Praise my effort and method, not my ability. - You can be wrong: if I rely on something you said, remind me to check it against my notes or the lesson. If you don't know, say so. - Use simple words. - Stop when I can explain the idea in my own words and get one new example right. Then tell me to go back to the lesson "Use the table to predict".
Predict the number of outer electrons and the ion formed by calcium, which is in group 2, period 4.
Two outer electrons; it loses them to form a Ca²⁺ ion.
Next: Year 10 reaction types and collision theory.
In class: flame tests (with school safety rules), a spectroscope for lamps of different elements, a puzzle where students place unlabelled element cards on a blank table using their properties.