ENGR 240 - 8.27.2007

ENGR 240 - 8.27.2007 - ENGR 240 August 27, 2007 Na 11 eee...

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ENGR 240 – August 27, 2007 Na O Atomic Number 11 8 Electrons in the atom e- -- ee ee ee ee e- e- ee ee ee ee Electron configuration 1s 2 2s 2 2p 6 3s 1 1s 2 2s 2 2p 4 Incomplete layers contain valence electrons Valence electrons – electrons that occupy the outer shell; important in bonding and reactivity Elements are most stable when they mimic noble gases 1. filled outer shell 2. stable electron configuration Na wants to give up electron O wants to gain 2 electrons Electronegativity – tells how much an atom wants to gain an electron; oxygen is more electronegative than sodium Table 2.7 gives values for electronegativity values I. Atomic Bonding A. Bonding occurs because atoms want more stable electron configuration 1. Interaction between 2 atoms i. strength of attractive force depends on type of bonding ii. repulsive force grows in strength when outer electron shells overlap iii. Net Force = Attractive + Repulsive iv. r 0 equilibrium spacing; distance between atoms where
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ENGR 240 - 8.27.2007 - ENGR 240 August 27, 2007 Na 11 eee...

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