10.26 - Lone Pair of e are electrons that are paired in the...

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Electron Configuration and the Periodic Table: The group number corresponds to the number of valence electrons The number of columns in each “block” is the maximum number of electrons that sublevel can hold The period number corresponds to the principle energy level of the valence electrons A Chemical Bond: is a strong attractive force that exists between certain atoms in a substance There are three types of bonds Ionic bonds: is a chemical bond formed by the electrostatic attraction between positive and negative ions o Form when one or more electrons are transferred from the valence shell of one atom to the valence shell of another atom o The atom that transferred the electron(s) becomes a Cation o The atom that gained the electron(s) becomes an anion Covalent bonds Metallic bonds A Lewis electron-dot symbol: is a notation in which the electrons in the valence shell of an atom or ion are represented by dots placed around the chemical symbol of the element Table 9.1 in book: Lewis Electron-Dot Symbol for
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Unformatted text preview: Lone Pair of e- are electrons that are paired in the Lewis-Dot Symbol Examples of Lewis-Dot Symbol: (see 1) Types of energy for adding and removing electrons: • The energy to remove an electron is the ionization energy • The energy to add an electron is the electron affinity –When the two ions bond, more than enough energy is released, making the overall process exothermic –Lattice Energy: is the change in energy that occurs when an ionic solid is separated into gas-phase ions. –Example: find the lattice energy for NaCl, we can use the fallowing steps (see 2) –Born-Haber cycle: is the process of finding the lattice energy indirectly from other thermochemical reactions –Ionic Substances are typically high-melting solids. There are two factors that affect the strength of the ionic bond. They are given by Coulomb’s (Law: See 3) –The higher the ionic charge, the stronger the force; the smaller the ion, the stronger the force....
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This note was uploaded on 10/30/2009 for the course CHEM 121 taught by Professor Bellew during the Spring '09 term at Minnesota.

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10.26 - Lone Pair of e are electrons that are paired in the...

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