Safety and evidence boundary
Use supplied data and models. This lesson is a public formative synthesis, not a confidential supervised assessment.
Explicit science instruction
A scientific synthesis should show why a model changed, not merely list scientist names. Connect an earlier model to what it explained, identify evidence it could not explain, and show how the revision resolved the conflict.
Evidence quality matters. A repeated numerical distribution is stronger than a dramatic anecdote, and a claim should stay proportional to the data.
Corrections are evidence of learning. Preserve an earlier model and annotate the revision instead of erasing the reasoning history.
Vocabulary: claim; evidence; reasoning; revision history; scope of inference.
Worked example with reasoning
Claim: positive charge is concentrated in a small nucleus. Evidence: most synthetic projectiles pass with minimal deflection while a tiny repeatable fraction scatter sharply. Reasoning: a diffuse-positive model cannot generate strong localized repulsion. Limitation: these data do not determine modern orbital shapes.
Guided question
Write one CER paragraph using the scattering distribution and one additional evidence stream without overstating what either proves.
Independent work
- Submit a before/after atomic model with evidence annotations.
- Write a CER using at least two independent evidence streams.
- Add one limitation and one future question.
Spiral retrieval bridge
- From Week 01: distinguish accuracy from precision.
- Why does a repeatable systematic bias matter when evaluating evidence?
- Calculate neutrons in ²³Na.
- Correct this statement: “Scientific models become facts once enough people accept them.”
Formative retrieval only.
Misconception check
Historical model sequences are not a ladder from wrong to perfect; earlier models can remain useful approximations within their scope.
Formative understanding check
What makes an atomic model revision scientifically defensible?
Reveal worked response
It is traceable to evidence, explains relevant observations better than the previous model, and states its limits.
Public self-check only.
Mentor evidence conference
Ask Archaemenes to identify the weakest link in your CER: claim precision, evidence specificity, reasoning, or limitation.
Archaemenes may challenge reasoning and help plan corrections, but does not grant official mastery.
Teacher guidance
Foundation: Use a CER frame with one scattering datum and one model change.
Core: Integrate two evidence streams and preserve a limitation.
Extended: Compare explanatory scope across three models and propose a discriminating future measurement.