Cheat Sheet for Intro/Phy
Chapter 19 ¡V Chemical Bonding I. Why do atoms form bonds? 1. Most stable atoms have a filled valence shell. Most of the time this is 8 electrons. 2. Lewis Symbols ¡V electron dot notation showing valence electrons. 3. Atoms form bonds by sharing, gaining, or losing electrons to obtain a filled valence shell. 4. The three major types of chemical bonds are Ionic bonds, Convalent bonds, and Metallic bonds. The type of bond formed depends on the Ionization Energy and electronegativity of the atoms involved. 5. Ionization energy (IE) The energy required to remove a valence electron. Metals have low IE and nonmetals have high IE. 6. Electro-negativity(EN) Very similar to electron affinity. Tendency of an atom to gain electrons, measure of how likely a given atom will steal electrons from another atom. Metals have low EN and nonmetals have high EN. Same reason as electron affinities. II. Ionic bonds. 1. When an atom with low IE is placed next to an atom with a high EN, the second atom may ¡§steal¡¨ an electron from the first element. 2. This transfer of electrons causes the atom that lost ¡§e¡¨ to form a smaller cation ( + charged ion) and the atom that gained ¡§e¡¨ forms a bigger anion ( - charged ion) 3. An ionic bond is the attracti
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Some common words found in the essay are:
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Approximate Word count = 1372
Approximate Pages = 5 (250 words per page double spaced)
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