Z is a compound of two elements, X and Y.
Element X shows a very large increase between its 5th and 6th ionisation energies. It has the second largest 1st ionisation energy in its group.
Element Y shows a very large increase between its 6th and 7th ionisation energies. It has the largest 1st ionisation energy in its group.
What is compound Z?
1 )
NO$_2$
2 )
PCl$_5$
P$_4$O$_{10}$
4 )
SF$_6$
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