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Effective Nuclear Charge Calculator
Find Zeff felt by an outer electron from atomic number and shielding.
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Effective nuclear charge Zeff
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Find Zeff felt by an outer electron from atomic number and shielding.
Effective Nuclear Charge Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Zeff = Z – S.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Effective Quick Guide
Typical values for reference.
| Z | Shielding S | Zeff | |
|---|---|---|---|
| 11 | 8.8 | 2.20 | |
| 12 | 9.15 | 2.85 | |
| 17 | 11.25 | 5.75 | |
| 19 | 16.8 | 2.20 | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Effective Nuclear Charge Calculator FAQ
Answers to common questions about this calculator.
The net positive charge felt by an electron after shielding by other electrons.
Use Slater rules, which assign shielding values by electron group.
Protons are added but shielding by same shell electrons is small.
It is a Slater rule estimate, not a full quantum calculation.