Slater's Rules (Screening Constants) (sigma = sum of screening contributions per Slater groups)
jee-mainjee-advancedneet-ug
sigma = sum of screening contributions per Slater groups
What each symbol means
| Symbol | What it stands for |
|---|---|
| \sigma | Total screening constant for the chosen electron |
| group factors | Same (ns,np): 0.35 each (1s is 0.30); (n−1) shell: 0.85 each e⁻; (n−2) and lower: 1.00 each; (n−1)d,f: 1.00 for ns/np tests |
When to use this
Approximate rules for estimating σ then Z_eff. d- and f-block cases have exam-specific variants; always follow the problem’s stated grouping if it differs slightly from your coaching table.