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CampbellCH4PP[1] - Campbell Chapter 4 D r a w B o h r m o d...

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Campbell Chapter 4 Draw Bohr models in your notebook for the following atoms. We are doing this to reinforce the number of valence electrons that each carries: H C N O How can we determine the # of covalent bonds each of the above atoms will form? Draw structural formulas for C 4 H 8 and C 4 H 10 Covalent Bonding Sharing pair of valence electrons Number of electrons required to complete an atom’s valence shell determines how many bonds will form Ex: Hydrogen & oxygen bonding in water; methane animation Polar/nonpolar covalent bonds Electronegativity attraction for electrons Nonpolar covalent •electrons shared equally •Ex: diatomic H 2 and O 2 Polar covalent •one atom more electronegative than the other (charged) •Ex: water animation Ionic bonding High electronegativity difference strips valence electrons away from another atom Electron transfer creates ions (charged atoms) Cation (positive ion); anion (negative ion) Ex: Salts (sodium chloride)
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