CHEM 001 Lecture Notes - Lecture 15: Valence Electron, Noble Gas, Royal Aircraft Factory F.E.2

• School: College of The Sequoias
• Department: Chemistry (CHEM)
• Course: CHEM 001
• Professor: guerra

Document Summary

List each energy shell on a row listing the subshells (s, p, d, f) for each shell in order of energy. To see the order the subshells are filled, draw parallel upper right to lower left diagonals. Main-group elements - valence electrons are in orbitals with the largest value of n. Transition metals - complicated, explained in chapter 24. Core electrons - unreactive electrons in completed shells. Core electrons may be written in [noble gas] shorthand since they are rarely used to form bonds. Atomic radii - half the distance between nuclei in a molecule of identical atoms. Atomic radius decreases across a period (left to right) Moving across a period, nuclear charge increases but shielding barely does. Electrons see the nucleus more and are pulled in closer. Electrons are attracted to the nucleus and repelled by each other. Effective nuclear charge (zeff) - the nuclear charge a specific electrons feels considering shielding effects.