Factors Affecting Atomic Radii

Factors Affecting Atomic Radii

1. Screening Effect

   • Caused by mutual repulsion btw electrons in the inner shell with those in the outer shell
   • Screening effect of the inner shell elctrons causes the atomic size INCREASES
   • The greater number of filled inner shells, the greater the screening effect and the larger the atomic size

2. Nuclear Charge

   • Corresponds to the number of proton s in the nucleus
   • The nuclear charge pulls all the electrons closer to the nucleus and cses the atomic size decreases
   • Effective nuclear charge,Z(eff)= Z- sigma *Z:actual nuclear charge *sigma: the screening constant