Lecture 4 - BIOL104-04 Principles of Biology I August 30,...

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BIOL104-04 Principles of Biology I August 30, 2010 Lecture #4 the Properties of Water
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Overview • Molecules form when atoms bond to each other • Chemical bonds are formed by electron sharing • The degree of electron sharing can vary • Nonpolar covalent > polar covalent > ionic bonds
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Periodic Table of the Elements
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Basic structure of atoms Common elements in organisms have at least one unpaired valence electron Atoms are most stable when each electron orbital is filled Unfilled electron orbitals allow formation of chemical bonds
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• The atoms in a molecule are joined by chemical bonds • Bonds can happen when – Atoms with opposite charges attract each other – Two atoms share one or more pairs of electrons – Or when atoms interact in other ways
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Covalent Bonds • Each atom’s unpaired electrons are shared by both nuclei to fill their orbitals
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This note was uploaded on 05/03/2011 for the course BIOL 104 taught by Professor Bray-speth during the Fall '11 term at Saint Louis.

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Lecture 4 - BIOL104-04 Principles of Biology I August 30,...

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