Grade 11 · Week 03 · U1
Essential question: Why can atoms of one element have different masses?
Open Monday Deep Lesson · Model, Worked Example & Practice
Mass spectra show several peaks for a single element.
Build an initial model and explanation for: Why can atoms of one element have different masses?
Record observations, questions, an initial model, and one claim that could be tested. Use these concepts where relevant: isotope; mass number; atomic mass; abundance; ion.
Open Tuesday Deep Lesson · Model, Worked Example & Practice
Study and explain the week's core ideas: isotope; mass number; atomic mass; abundance; ion
Trusted isotope and mass-spectrum examples.
Revise Monday's model. Add two evidence-backed annotations and explain one limitation or uncertainty.
Open Wednesday Deep Lesson · Model, Worked Example & Practice
Weighted-average atomic mass.
Show units, setup, calculation or graph reasoning, then write what the quantitative evidence can and cannot establish about: Why can atoms of one element have different masses?
Open Thursday Deep Lesson · Model, Worked Example & Practice
Mass-spectrum data analysis; no radioactive materials.
Use the course safety charter. If supervision, facilities, materials, or conditions are not appropriate, use the supplied-data/simulation alternative rather than improvising hazardous procedures.
Record variables or design constraints, procedure/model, observations/data, and one revision you would make after reviewing the evidence.
Open Friday Deep Lesson · Model, Worked Example & Practice
Answer the essential question: Why can atoms of one element have different masses?
Submit a claim, at least two specific pieces of evidence, reasoning that connects them, one limitation/counterclaim, and a correction note for any essential concept below 80%.
Select one artifact from this week and explain why it is trustworthy evidence of growth.