Allred-Rochow scale

The Allred-Rochow scale measures the effective nuclear charge felt by an electron in an atom, considering both the positive charge of the nucleus and the shielding effect of other electrons. It helps predict how strongly an atom attracts electrons in chemical bonds, which influences reactivity and bond formation. The scale accounts for the number of protons (nuclear charge) and how inner electrons shield outer electrons, providing a more accurate measure of an atom's ability to attract additional electrons than just the atomic number alone. It is useful for understanding periodic trends in element behavior.