CHEM B1110 Lecture Notes - Lecture 7: Electron Configuration, Atomic Radius, Noble Gas
8 Dec 2016
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Excited state- 1 or more electron is in a higher energy orbital. The rest are core electrons n=4 is the highest energy in potassium. The goal with ion formation or sharing electrons is for the ion to look electron wise like a noble gas. Main group elements- number of valence electrons equal the number of electrons in highest energy s and p sublevels. Number of valence electrons for an element is equal to its roman numeral group number on the periodic table. Elements in the same group have the same number of valence electrons. Distance from the center of the nucleus to outer edge of the atom. Typically expressed in units of picometers (10^-12 m) Across a period- atomic charge increases thereby pulling electrons closer to the nucleus. Down a group- valence level increases so orbital radius increases. If in the same period- element with higher nuclear (farthest right) is smaller.
