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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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Thursday, August 16, 2012

Introdcution to Rotational Symmetry

See the figures as follows:

http://upload.wikimedia.org/wikipedia/commons/3/35/Carbon_dioxide_structure.png http://www.3dchem.com/inorganics/bcl3a.jpg  

Symmetri rotation is a qualitative method to know how much folds needed to form full rotation of an compound. For example, the angle between Cl - B - Cl in BCl3 (Right) is 120 o. We need 3 times fold to make full rotation. That's for the vertical plane. For horizontal plane, because BCl3 is a planar compound, we need two folds to make a full rotation.

We can write this statement in an expression:

Where n is an integer value (1,2,3.....)
Vertical plane rotation of BCl3 can be written as C3 (3 rotations)
Horizontal plane rotation of BCl3 can be written as C2 (2 rotations)


Housecroft. Inorganic Chemistry

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