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April 20, 2014

Homework Help: Science

Posted by Poonam on Monday, March 12, 2012 at 5:18pm.

The line spectra of two elements are not identical because-
(A)The element do not have the same number of neutrons
(B)They have different mass numbers
(C)Their outermost electrons are at different energy levels
(D)They have different valencies

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