BIOL 1201 Jan 15=(2)-1

BIOL 1201 Jan 15=(2)-1 - BIOL 1201: 1/15/09 Table...

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BIOL 1201: 1/15/09 Table 2.1:Natually Occurring Elements in Humans Distribution of electrons in orbital shells is important in regard to chemical reactivity Ex. Fig 2.9 Inner shell holds 2 electrons Outer shell can hold up to 8 electrons and determines chemical reactivity What Determines the Number an Type of Chemical Bond Number= valence Valence is the number of electrons needed to fill the outer shell Type= electronegativity o Electronegativity- how strongly nucleus attracts electrons. Bigger the nucleus, the stronger the attraction Electronegativity chart(online) Chemical Bond Forces holding atoms together in molecules Characterized as “Strong” or “Weak” depending on the energy required to make/break the bond Strong o Covalent bond- involves sharing of electrons Ex in Fig 2.12 Weak o Non-covalent (don’t involve sharing electrons) Ionic interactions- attraction of opposite charges. One atom donates an electron to another Hydrogen bond between partially charged atoms Valence vs. Valence Electrons Valence
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This note was uploaded on 09/08/2011 for the course BIO 1201 taught by Professor Sibenaller during the Spring '10 term at LSU.

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BIOL 1201 Jan 15=(2)-1 - BIOL 1201: 1/15/09 Table...

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