7.012 Lecture Notes - Lecture 2: Caesium, Francium, Electronegativity

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Biological molecules are assembled from only a small subset of the atoms present in the periodic table. Hydrogen bonds between biological molecules and water determine solubility. Hydrophobic interaction interaction of nonpolar substances in the presence of polars substances (especially water) van der waal"s interaction interactions of nonpolar substances. Fluorine (the most electronegative element) is assigned a value of 4. 0, and values range down to caesium and francium which are the least electronegative at 0. 7. A chemical property that describes the tendency of an atom or a functional group to attract electrons towards itself. Sheds protons example: acetic acid, which gives vinegar its sour taste has acidic properties because it is so polar. In the case of two methyl groups, neither of which can ionize, they are not attracted to water. The structure of amphipathic molecules gives us a clue as to how biological membranes are assembled. Condensation reaction is sometimes referred to as dehydration.

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