Shielding Constant Calculator

Calculate the shielding constant (σ) for any electron using Slater's rules with detailed breakdown.

Electron Configuration

1s

2s

2p

3s

3p

3d

4s

Target Orbital (calculate σ for electron in this orbital)

Shielding for 3p electron

Shielding From	Electrons	Rule Applied	Contribution
1s	2	2 x 1.00 (inner core)	2.00
2s	2	2 x 0.85 (n-1 shell)	1.70
2p	6	6 x 0.85 (n-1 shell)	5.10
3s	2	2 x 0.35 (same shell s,p)	0.70
3p	5	(4) x 0.35 (same group)	1.40
Total Shielding (σ)			10.90

Z (Nuclear)

17

σ (Shielding)

10.90

Zeff

6.10

Slater's Shielding Rules

Electrons in the same (ns, np) group: 0.35 each (0.30 for 1s)
Electrons in (n-1) shell s and p orbitals: 0.85 each
Electrons in (n-2) or lower shells: 1.00 each
Electrons in d and f orbitals: 1.00 (for s,p valence) or 0.35 (for d,f valence)