Today is rung 3 of 6 on this topic
Atomic structure and periodic trends
Can do: Uses the periodic table to predict properties, and explains trends by electron arrangement.
Why it matters
The table is a predictive tool, not a lookup list. Understanding why the trends exist replaces a great deal of memorisation.
What it looks like when it's wobbly
Treats the table as a reference chart and memorises trends without any underlying reason.
⏱️ Two-minute check
"Why is sodium more reactive than magnesium? Why does atomic radius shrink across a period?"
Solid looks like: Reasons about outer electrons and nuclear charge, not memorised statements.
The full activity for this topic · 30 minutes
Predict Before You Look
- 1Cover the data and predict which of two elements is more reactive, larger, or a better conductor.
- 2Write the reasoning before checking.
- 3Check against real data and mark where the reasoning failed, not just the answer.
- 4Draw electron arrangements for the first twenty elements and connect them to group behaviour.
- 5Find real-world evidence: why sodium is stored in oil, why noble gases fill light bulbs.
If it's too hard
Predict within one group.
If it's too easy
Explain an anomaly in a trend and find out why it exists.
Say this
"Don't tell me the trend — tell me why the trend has to be that way."