FSHN 101 Lecture Notes - Lecture 11: Electronegativity, Noble Gas, Sucrose

• School: University of Illinois
• Department: Food Science and Human Nutrition
• Course: FSHN 101
• Professor: Bohn Dawn

Document Summary

All matter is composed of atoms or elements. Compounds (or molecules: composed of two or more elements, to form compounds, elements are held together by not electrical forces of attraction called chemical bonds. A chemical bond forms between elements if the resulting arrangement of elements has a lower energy than the sum of the energies of the separate. Pictures: composed of two or more compounds, compounds retain their discrete chemical identity in the mixture. Tuesday, september 20, 2016: a few rules to remember: The aufbau principle: every elements has the same number of electrons as the one before it, plus on extra. Ionic bonds: attraction between opposite charges of cations and anions: complete transfer of one or more electrons from one element to another followed by an attraction of these oppositely charged ions. Covalent bonds: bonded elements (or atoms) share pairs of electrons: example: methane (ch4) wand water (h20)