Chapter 2 (2)

Chapter 2 (2) - Chapter 2 Atoms, Molecules, and Life What...

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Chapter 2 Atoms, Molecules, and Life What are atoms? o The basic structural unit of matter o Protons – positive charge o Neutrons – no charge o Electrons – negative charge Elements differ in # of Protons o An element is defined by # of protons = atomic # Has specific physical and chemical properties Can’t be broken down by chem. reaction o Atomic mass = # of protons + neutrons Building-Up Principle o Electrons fill the shell closest to the nucleus then begin to occupy the next shell 1 st ; 2 electrons 2 nd ; 8 electrons 3 rd ; 8 electrons o Example: Atomic # of Carbon (C) = 6 6 electrons 2 in 1 st shell 4 in 2 nd shell Isotopes o Atomic mass = # of protons + neutrons Isotopes vary in number of neutrons Ions o Atoms that vary in # of electrons in outer shell; atoms are most stable when outer electron shell is full o Extra electrons create – charge o Fewer electrons create + charge What’s your atomic number and electron configuration? o
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This note was uploaded on 03/20/2012 for the course BIOL 1001 taught by Professor Minor during the Fall '08 term at LSU.

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Chapter 2 (2) - Chapter 2 Atoms, Molecules, and Life What...

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