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Published byThomasina Lester Modified over 5 years ago
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Ionic compounds made up of positive and negative ions, but overall neutral Consist of a metal and nonmetal Also can include polyatomic ions which is a charged compound Crystalline solids at room temperature Strong bonds due to attraction of neighbor ions and reduction of repulsions NaCl has a melting point of 8000C!
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Ionic bonds Opposite charges of anions and cations attract each other
one or more atoms lose electrons and one or more atoms gain those electrons Criss-cross the charges as new subscripts Simplify subscripts by common denominator if possible
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Ionic Bond Examples Sodium forms Na1+ Chlorine forms Cl1-
sodium (Na) and Chlorine (Cl) react to form sodium chloride (NaCl, aka table salt) Sodium forms Na1+ Chlorine forms Cl1- Na1++Cl1- Na1Cl1 NaCl
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Ionic bond example #2 Aluminum (Al) and Bromine (Br) react to form Aluminum bromide (AlBr3) Aluminum forms Al3+ Bromine forms Br1- Al3++Br1- Al1Br3 AlBr3
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Metallic Bonds Closely packed cations and loosely held valence electrons Think sea of valence electrons for pure metal (mobile and drifting free) Think fruit at a grocery store Good conductors of electric current (electrons moving freely) Metal can be shaped (pushed into wire form without breaking)
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Alloys Combination of two or more elements with at least one being a metal Superior properties of individual elements Harder and more durable, but easier to shape Ex bronze, sterling silver
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