SCTM 2B09 Lecture Notes - Lecture 1: Electronegativity, Bohr Model, Ionic Bonding
6 Jan 2016
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Document Summary
Every matter just wants to be at the lowest energy state. Secondary interaction takes a polymer from having a low boiling point to a high boiling point. Isotopes mean elements have different number of neutrons. Periodic table= each matter has a molecular mass / weight, = average is the value of the molecular weight. Chemists came up with the term mole that defines the unit of the atoms. Mathetmatically speaking, 18 ml of water is 1 mole of water. Further away from it, higher the energy, not stable. Releases energy as soon as it jumps down a shell. Octate rule, having eight electrons at the most outer shell. Electron valence, shares electron = covalent bond, donates electron= ionic bond. Difference in electronegativity = high= giving up electrons = ionic. Small difference = low = might just share = covalent. Things that are gonna be together tightly= atoms not gonna resolve.
