The first four ionization energies for the elements X and Y are shown below. The units are

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The first four ionization energies for the elements X and Y are shown below. The units are not kJ/mol.

First Second Third Fourth X 170 350 1800 2500 Y 200 400 3500 5000

Identify the elements X and Y. There may be more than one correct answer, so explain completely.  

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Chemistry An Atoms First Approach

ISBN: 9781305079243

2nd Edition

Authors: Steven S. Zumdahl, Susan A. Zumdahl

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