Textbook Problem

r Questions 11—13, you will need to consider ionizations beyond the first ionization energy. For example, the second ionization energy is the energy to remove a second electron from an element.

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

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	X	Y
First	170	200
second	350	400
Third	1800	3500
fouth	2500	5000

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