September 4- ch 2 continued

September 4- ch 2 continued - September 4, 2007 Chapter 2...

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September 4, 2007 Chapter 2 Electron Shells Larger atoms can accommodate more electrons than smaller ones can o More protons means more Electrons are distributed about that nucleus of an atom in electron shells o The first shell or energy level holds 2 electrons o The second shell holds up to 8 Roles of the nucleus and the electrons Electrons shells correspond to energy levels Energy exciting an atom causes an electron jump from a lower to a higher energy shell Later the electrons fall back down and energy is release How atoms interact to form molecules Only interact when the outermost electron shells vacancies Charge atoms form ionic bonds Uncharged atoms can stabilize by forming covalent bonds Most biological molecules feature covalent bonds Electrons sharing determines covalent bond polarity Highly reactive free radicals… Atoms interact Reactions between atoms depend upon the configuration of electrons in the outermost electron shell o Neon, with 8 electrons in the outermost shell Atoms will react with other atoms if the outermost shell is partially full
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This note was uploaded on 04/10/2008 for the course BIOLOGY 101 taught by Professor Beitch during the Spring '07 term at Quinnipiac.

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September 4- ch 2 continued - September 4, 2007 Chapter 2...

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