STEM AND ASSESSMENT EVIDENCE WORKBENCH
Parse explicit orbital occupancies, reconcile electron totals with proton count and signed charge, and flag capacity or count conflicts.
Review output
Load the worked example to inspect realistic inputs, or enter anonymous classroom or laboratory evidence. Results remain in this browser tab until you copy or download them.
Transparent method
Expected electrons equal proton count minus signed ionic charge. Each token supplies principal shell, subshell letter, and occupancy. Capacities are s two, p six, d ten, and f fourteen; p begins at shell two, d at three, and f at four. Duplicate orbital labels are rejected, then valid occupancies are summed and compared with both expected and claimed counts. A supported row means the entered configuration tokens are syntactically valid, stay within the bounded capacities, total the expected species electron count, and agree with the learner count. It does not establish the correct ground-state arrangement. Use the report to locate count evidence, then inspect energy order, diagrams, pairing, and known exceptions with the approved course model.
Confirm the prompt, approved source, units, symbols, notation, expected model, and review threshold. Keep an unchanged copy of observations or learner responses before editing any row.
Run the worked example, inspect intermediate rows, and compare the evidence with a hand calculation, diagram, physical model, periodic table, or moderated assessment source.
Record the method, assumptions, units, classifications, rounding, and flagged rows. Treat the downloaded report as editable evidence and verify it independently before instruction or assessment.
How to interpret the result
Use after a learner writes a full configuration and the first question is whether its occupancy count and subshell capacities fit the stated species. The workbench does not verify lowest-energy order, Hund pairing, electron spin, excited states, condensed notation, transition-metal exceptions, or the convention for removing electrons from transition-metal ions.
Sodium has eleven protons and neutral charge, so its parsed tokens total eleven. Oxide has eight protons and charge negative two, so ten electrons are expected and found. The magnesium ion configuration totals the correct ten electrons, but the learner count says twelve and is flagged. Neutral chlorine reconciles at seventeen.
Expected electrons equal proton count minus signed ionic charge. Each token supplies principal shell, subshell letter, and occupancy. Capacities are s two, p six, d ten, and f fourteen; p begins at shell two, d at three, and f at four. Duplicate orbital labels are rejected, then valid occupancies are summed and compared with both expected and claimed counts.
A supported row means the entered configuration tokens are syntactically valid, stay within the bounded capacities, total the expected species electron count, and agree with the learner count. It does not establish the correct ground-state arrangement. Use the report to locate count evidence, then inspect energy order, diagrams, pairing, and known exceptions with the approved course model.
Do not use mass number as proton count, reverse the sign effect of ionic charge, exceed subshell capacity, duplicate an orbital, omit inner electrons in a full-notation task, or treat a correct total as proof of correct arrangement. Confirm element identity, ion charge, notation convention, filling order, and exception policy separately.
Learning boundary
This browser-local workbench applies only the disclosed model to entered values. It cannot diagnose a learner, certify an experiment, establish a chemical fact, classify a task automatically, or replace teacher and laboratory judgment.
Review checklist
Practical questions
No. Processing occurs in the current browser tab. Avoid names and other personal information, and retain authoritative records only in the system approved by the school.
No. It reports how the entered evidence behaves under one disclosed rule. Ask for reasoning and compare several evidence sources before reaching an educational conclusion.
Treat it as an editable calculation aid. Show your own reasoning, cite required sources, use the course method, and follow the applicable academic-integrity rules.
YOUR NIRMION
