CHEM101 Lecture Notes - Lecture 5: Ionization Energy, Valence Electron, Electron Configuration
Document Summary
Atomic radius decreases moving from left to right. Due to increasing zeff which draws valence electrons closer to the nucleus. Within columns radius increases from top to bottom. As valence electrons are in higher quantum shells, hence averagely further form the nucleus. Net positive charge experienced by an outer shell electron in a multielectron atom, dependant on the protons and inner shell electrons, same as the ionisation energy. Smaller than parent atoms, as electrons have been removed from the outermost shell, and the repulsions between electrons are reduces, and hence more strongly attracted to the nucleus. Larger than parent atoms, due to increase of electron-electron repulsion, forcing electrons to be further apart from one another. Both increase in size as you go down the column. As outermost electrons belong to a higher principal quantum number shell. Neutral or charged toms which the same electron configuration. E. g li+, be2+ and b3+ all have the electron configuration of 1s2.
