UT BIO 311C - Atoms and Elements (2 pages)

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Atoms and Elements



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Atoms and Elements

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Lecture number:
1
Pages:
2
Type:
Lecture Note
School:
University of Texas at Austin
Course:
Bio 311c - Introductory Biology I

Unformatted text preview:

BIO311C 1nd Edition Lecture 1 Outline of Last Lecture Syllabus Day Outline of Current Lecture Atoms and Elements Bonding Hydrophobic and Hydrophilic Current Lecture Mass 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 8 E g NaCl Polar Covalent Electronegativity 5 but 1 8 These 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 H2O Non 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 water



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