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Chemistry Review

Chemistry Review - Chemistry Review 1 Electro negativity a...

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Chemistry Review 1. Electro negativity- a measure of the ability of an atom in a chemical compound to attract electrons Active metal- a metal, such as sodium or potassium, that is unusually reactive. EN < 1.4 Active-non metal- Transition metal- It commonly refers to any element in the d-block of the periodic table , including zinc , cadmium and mercury . This corresponds to groups 3 to 12 on the periodic table . 2. Total  Number of  electron  pairs Arrangement of  electron pairs Number of  bonding  pairs of  electrons Number of  lone pairs  of  electrons Shape of Molecule Name of  Shape Bond  Angle Examples not  applicable linear 1 not  applicable linear 180 o H 2 , HCl 2 linear 2 0 linear 180 o CO 2 , HCN 3 trigonal planar 3 0 triganol  planar 120 o BCl 3 , AlCl 3 4 tetrahedral 4 0 tetrahedral 109.5 o   CH 4 , SiF 4 3 1 trigonal  pyramidal <109.5 (bond  angles in  ammonia,  NH 3 , are  107 o ) NH 3 , PCl 3 2 2 bent <109.5 (bond  angles in  water, H 2 O,  are 105 o ) H 2 O, SCl 2
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5 trigonal 
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