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Chemistry D9

QuestionAnswer
Polyatomic ions Ions which are formed when a group of atoms gains or loses electrons
Ammonium NH4
Hydroxide OH
Chlorate ClO3
Chlorite ClO2
Nitrate NO3
Nitrite NO2
acetate C2H3O2
Cyanide CN
Carbonate CO3
Chromate CrO4
Dichromate Cr2O7
Molecular shape determination Determine the Lewis structure of the molecule.
Molecular shape determination If there are only two atoms in the molecule or if there are only two groups of electrons around the central atom, then the molecule must be linear and have a bond angle of 180o
Molecular shape determination If there are three groups of electrons around the central atom, then the shape is trigonal with a bond angle of 120o
Molecular shape determination For every non-bonding pair of electrons, you must take a “leg” of the tetrahedron away. Thus, if there are no non-bonding electrons around the central atom, the shape is tetrahedral with a bond angle of 109o
Molecular shape determination If the central atom has one pair of non-bonding electrons, then you have a tetrahedron with one leg removed. This results in a pyramidal shape, with a bond angle of about 107o
Molecular shape determination If two non-bonding electron pairs surround the central atom, then two legs of the tetrahedron are missing. This ends up giving the molecule a bent shape with a bond angle of approximately 105o
Created by: jacquixg
 

 



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