Chapter 11, Problem 11ALQ

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.

Compare the first ionization energy of helium to its second ionization energy, remembering that both electrons come from the 1s orbital.

l>

	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.