Which of the following statements about effective nuclear charge \((Z_{\text{eff}})\) is incorrect?
1
\((Z_{\text{eff}})\) increases as the number of protons increases in a period.
2
The greater the shielding by inner electrons, the smaller the value of
3
\((Z_{\text{eff}})\) is always equal to the atomic number of the element.
4
Moving down the group,