CH-1010 Lecture Notes - Lecture 2: Atomic Number, Oxyanion, Electric Potential Energy
11 May 2016
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Document Summary
Most compounds are more stable than the free elements that make them up. This is because atoms or ions linked together by chemical bonds tend to be lower in energy than the free atoms or ions. Strong attraction between ions of opposite charges. Form of potential energy called electrostatic potential energy (eel) (q1 x q2)/d where q=their charges and d= the distance between their nuclei. Two ions with the same charge (++) or (--) repel each other. The greater the attraction, the more negative the eel value. More negative energy = more stable configurations. (b) as the ions become closer together, eel rises (becomes for negative) (c) this energy minimum corresponds to a stability maximum and the formation of an ionic bond between the opposite ions. the more negative the bond, the stronger it is. (d) they will repel at this point.
