4 posts • Page 1 of 1
From http://wwwchem.uwimona.edu.jm/courses/CHEM1902/IC10K_MG_Fajans.html : "The ability of a cation to distort an anion is known as its polarization power and the tendency of the anion to become polarized by the cation is known as its polarizability."
A cation's polarizing power refers to its ability to attract valence electrons from a nearby anion and polarizability refers to the anion's tendency to become polarized by the cation. Small cations with high positive charges are said to have more polarizing power because the positive charge is distributed over a much smaller area. The larger the size of the anion, the greater the polarizability because it is easier to distort the electron cloud the bigger the ion is. In general, polarization occurs when a small cation distorts the valence electron shells of a larger anion.
When atoms or ions are larger, have less electronegativity and less positive charge, they have more polarizability. When they have smaller size, more electronegativity and more positive charge, they have more polarizing power.
Who is online
Users browsing this forum: No registered users and 2 guests