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 Final Grades:                   sect-1                        sect-5



 1- Given that the angle (oa,ob) is 70.5 degree (see figure), use symmetry arguments to find the angle (oa,oc).

 2- What are the most dense elements in the world?

 3- What is the smallest atom? What is the largest?

 4- Which countries use desalination the most?




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 last up-dated: Rabi-I, 1430