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Chemical Bonding - Ionic Bonds
Mark Penningtonon 12 March 2012
Transcript of Chemical Bonding - Ionic Bonds
formed between atoms
give us the entire variety of
materials we see all around us? How can we use the periodic table
to predict what will bond? What is a Chemical Bond? Chemical Bonds and electromagnetic force Orbital shape and charge Polarization Forming Bonds Overlapping Oribitals Polarization between atoms Bond Types Ionic Bond Covalent Bond Bonding Chemical Bond:
A force resulting from the redistribution of energy contained by orbiting electrons, which tends to bind atoms together to form compounds. Bonding in Models & Diagrams Model Limitations Overlapping Orbitals Surface color Water Prediciting Bonding Types Electronegativity Ionization Energy
Electronegativity Ionization Energy The kind of bond is determinded by the relative difference in electronegativity & ionization energies 3 Possible Scenarios Both atoms have similar EN & IE. Moderate difference between atoms - 1 atom has medium EN & IE and the other has high (or low) EN & IE A large difference exists - 1 atom has high EN & IE while the other has low EN & IE. Ionic Bonds Transfer of Electrons Crystalization Metallic Bonds Sea of electrons Atoms Low EN & Low IE Atoms that share e's with all the other atoms Valence Electrons
Binding Patterns Only Valence electrons bond Only unpaired valence electrons
particpate in bond formation @ valence e contributes one unit of positive
charge in the creation of a cation @ valence e can contribute 1 unit of
negative charge in the creation of an anion Octet Rule 8 valence e's = chemical stability H, Li, Be, B stability
mimics He - 2 valence e's removal or addition e's seeks to achieve chemical stability
(2e's or 8e's) check the e dot formulas of atoms Electron congfiguration of ions Assumes the e configuration of the closest Noble Gas Simple Ionic Formulas Ionic Compound
Whole number ratio of cations & anions whose total charge = zero Result:
Formula Unit repeating unit in crystal How to Write Binary Ionic Formulas Review: NEXT