BIO311C 1nd Edition Lecture 1 Outline of Last Lecture Syllabus-DayOutline of Current Lecture - Atoms and Elements - Bonding - Hydrophobic and HydrophilicCurrent LectureMass in decimals of elements – average mass of elements – serves as proof of isotopes Isotopes go through radioactive decay changing into other elements E.g. carbon 14 turns into nitrogen 14. Decay occurs over an exponential curve based on half-life of each element – all carbon 14 atoms follow the same curve Atomic Zen: Having a full octet or 8 valence electrons – full and stable SCHNOP – 6 main elements - Sulfur - Carbon - Hydrogen - Nitrogen- Oxygen - Phosphorus Types of Bonds:Ionic = Electronegativity > 1.8E.g. NaClPolar Covalent = Electronegativity > .5 but < 1.8These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.E.g H2ONon-polar covalent = Electronegativity = < .5 E.g. CH Ionic bonds are strong but have low energy Covalent bonds have high energy but weak bonds Hydrogen Bonding: Results as a form of attraction between a hydrogen atoms of one molecule to a strongly electronegative atom of another molecule. Polar molecules tend to be hydrophilic meaning they like to be around water while non-polar molecules tend to be hydrophobic which means they do not react with
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