CHM 111 Lecture Notes - Lecture 8: Valence Electron, Bond Length, Atomic Number

• School: Miami University
• Department: Chemistry & Biochemistry
• Course: CHM 111
• Professor: Jill Susan Page

Document Summary

In the stratosphere, a steady cycle keeps the concentrations of o2 and o3 constant while absorbing uv radiation from the sun. Ozone molecules are destroyed when chlorofluorocarbons are released into the atmosphere. The formation of free radicals from cfc"s cause the ozone to break down, depleting the protective layer and allowing more uv light to reach the earth. We need to further explore matter and atoms and molecules. Atom is mostly empty space, electrons do not follow circular orbits; distribution of electrons is described best using statistics. If the nucleus was 1 cm across, the whole atom would be the size of a football field: the probability of finding an electron around the nucleus electron cloud . Elements are arranged based on atomic number. Also arranged into columns: based on the number of electrons they have, they have similar properties. The electrons in the outermost energy levels are the valence electrons.