Chapter 9: Ionic and Covalent Bonds

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Salts being first explanation of substances that are ionic. Ionic bond- is a chemical bond formed by the electrostatic attraction between positive and negative ions. Bond forms between two atoms when one or more electrons are transferred from the valence shell of one atom to the valence shell of another. Atom losing electrons is a cation (negative ion) Atom gaining electrons is a anion (positive ion) Ionic solid is when large number of ions gather together (opposite charges) Lewis electron-dot symbols is a symbol in which the electrons in the valence shell of an atom or ion are represented by dots placed around the letter symbol of the element. Forming ions required additional energy equal to atleast 147 kj/mol. Negative value means energy released, positive means energy is required. To get energy for the formation of one ion pair you multiple avogadro s number 6. o2 x 1023.

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