EDUCATION DECISION WORKBENCH
Compare a neutral atom configuration through krypton with an Aufbau model that includes chromium and copper exceptions.
Review output
Load the worked example to inspect realistic inputs, or enter anonymous, policy-approved information. Results remain in this browser tab until you copy or download them.
Transparent method
Electrons fill the implemented order 1s, 2s, 2p, 3s, 3p, 4s, 3d, and 4p with capacities 2, 2, 6, 2, 6, 2, 10, and 6. A neutral atom contains Z electrons. The generator then adjusts neutral chromium from 4s2 3d4 to 4s1 3d5 and copper from 4s2 3d9 to 4s1 3d10 before comparing orbital counts. A match means the full entered occupancies agree with this neutral ground-state model and total Z electrons. A count mismatch can exist even if early orbitals look correct; an orbital mismatch points to the first visible difference in the comparison table. Some textbooks write 3d before 4s in the final notation, so evaluate occupancy rather than relying only on token order.
Confirm the question, variables, units, source data, measurement precision, and the model expected by the current course or laboratory. Keep an untouched copy of observations before excluding or transforming any value.
Run the worked example first, inspect every intermediate row, compare units and signs, and look for a result that conflicts with the graph, physical system, chemical equation, or learning objective.
Record the method, assumptions, units, rounding, data limitations, and any excluded observations. Compare the exported report with an independent calculation or approved reference before assessment or laboratory use.
How to interpret the result
Use this diagnostic after learners know orbital capacities and filling order and need evidence about the first occupancy mismatch. It totals electrons, compares each orbital, and includes the familiar neutral chromium and copper exceptions. The report can guide a targeted discussion about capacity, sequence, or electron count without reducing the response to one score. It does not model ions, term symbols, spin diagrams, or spectra.
The fictional iron response contains 1s2 2s2 2p6 3s2 3p6 4s2 3d6. Its occupancies total 26, matching atomic number 26, and every supported orbital agrees with the generated configuration. For chromium, the model would use 4s1 3d5, and for copper 4s1 3d10, rather than applying a simple 4s2 pattern without the common exceptions.
Electrons fill the implemented order 1s, 2s, 2p, 3s, 3p, 4s, 3d, and 4p with capacities 2, 2, 6, 2, 6, 2, 10, and 6. A neutral atom contains Z electrons. The generator then adjusts neutral chromium from 4s2 3d4 to 4s1 3d5 and copper from 4s2 3d9 to 4s1 3d10 before comparing orbital counts.
A match means the full entered occupancies agree with this neutral ground-state model and total Z electrons. A count mismatch can exist even if early orbitals look correct; an orbital mismatch points to the first visible difference in the comparison table. Some textbooks write 3d before 4s in the final notation, so evaluate occupancy rather than relying only on token order.
Do not exceed s or p capacity, use atomic mass as electron count, omit inner orbitals when full notation is requested, apply neutral filling directly to transition-metal ions, or forget chromium and copper exceptions. Count all superscripts, distinguish filling sequence from final written convention, and use an orbital diagram when pairing and spin evidence are part of the task.
Learning boundary
This browser-local workbench calculates only from the entered model and observations. It cannot validate an experiment, balance an equation, establish causation, certify laboratory safety, diagnose learning, or replace the method required by a teacher, curriculum, laboratory, or institution.
Review checklist
Practical questions
No. The calculation runs in the current browser tab. Avoid personal information and retain laboratory data in the system authorized by the school.
Treat it as an editable analysis aid. Show your own reasoning, cite the required sources, follow academic-integrity rules, and use the method requested by your course.
No. Check dimensions, graph shape, assumptions, measurement uncertainty, significant figures, and whether another model explains the observations better.
YOUR NIRMION
