CHEM 111 Lecture Notes - Lecture 14: Atomic Nucleus, Electron Configuration, Electromagnetism

• School: BYU
• Department: Chemistry and Biochemistry
• Course: CHEM 111
• Professor: David Dearden

Document Summary

Solutions look like those of the h atom, except. Some of the h atoms degeneracies disappear due to interactions between electrons. This always inclues all e- in the outermost shell d or f in the next lower shell are also valence as long as the d or f subshell is not full. Lewis symbols show the element via its symbol, surrounded by dots (or lines) indicating valence electrons. Core electrons influence how well the valence electrons see" the nucleus how tightly they are attracted to its ositive chathe. The more core electrons, the less the effective charge of nucleu as seen by the valence electrons. Within a give n s electrons penetrate the core best, are the least shielded, and are the best shielders. Lower values of n regardless of subshell, mean electrons are better shielders. 4s before 3d, but 3d electrons shield 4s so 4s electrons will be lost before 3d.