Effective Nuclear Charge

#Chemistry

$\displaystyle Z_{\text{effective}}=Z-A-\frac{1}{2}\text{# valence }e^{-}$

• A rough approximation for $\displaystyle Z_{\text{effective}}$, or the effective nuclear charge of an atom
• $\displaystyle Z$ is the number of protons in the atom
• $\displaystyle A$ is the mass of the atom