Students of Class 9th ,10th and 11th . Try to solve following exercise on Atomic structure.
http://www.youtube.com/watch?v=Yz2eUKhHC58&feature=youtu.be
http://www.youtube.com/watch?v=Yz2eUKhHC58&feature=youtu.be
http://www.youtube.com/watch?v=Yz2eUKhHC58&feature=youtu.be
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