CHEM-UA 125 Chapter Notes - Chapter 9: Atomic Radius, Delocalized Electron, Thermal Conductivity
24 Jun 2015
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Bonding lowers potential energy between positive & negative particles (whether they are oppositely charged ions or nuclei and electrons, metallic behavior of elements. 3 models of bonding result from 3 ways atoms combine: Ionic bonding: b/w atoms w/ large differences in their tendencies to lose/gain electrons: metal + nonmetal, electron transfer & ionic bonding, occurs b/w reactive metals (group 1a, group 2a) & nonmetals (group. 7a, group 16: transfer of electron(s) from metal nonmetal. Each atom forms an ion w/ noble gas electron configuration. Electrostatic attractions b/w positive & negative ions draw them into 3-d array to form ionic solid: chemical formula of ionic compound: empirical formula, giving cation-to- Each nonmetal atom holds onto its own electrons tightly (high ie) Metals share their valence electrons, but not by covalent bonding. Atoms in sample of metal pool their valence electrons into a sea of electrons flowing b/w & around each metal-ion core. 3 ways elements combine: lewis electron-dot symbol.
