CHEM 103 Lecture Notes - Fall 2018 Lecture 6 - Periodic trends, Diamagnetism, Nonmetal
20 Sep 2018
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Chem 103 lecture 6 electron configuration in atoms. Example: na has 11e-s [1s2 2s2 2p6] 3s1. The favored configuration is when e- have different magnetic quantum numbers (ml) and the same spin numbers (ms) The next atom is nitrogen (one more p e- than c) The next atom is oxygen (one more p e- than n) Na [ne] 3s1 ~~~~~~> na+ [ne] + e- O [he] 2s2 2p4 ~~~~~> o2- [he] 2s2 2p6. Example: write the electronic configuration for xe and w practice! 4s electrons are the last first first in first out . Based on their electron configurations, substances can be classified into two groups. Paramagnetic: 1 or more electrons, attracted to an external magnetic field. Cr 24e-s [ar] . Diamagnetic: no unpaired electrons, mildly repelled by an external magnetic field. 2s 2p: predict the magnetic behavior of each ion. Chemical and physical properties are a periodic function of atomic number.
