Classification Of Elements And Periodicity In Properties Ques 221
Question: The correct sequence of elements in decreasing order of first ionisation energy is [MP PET 1997]
Options:
A) $ Na>Mg>Al $
B) $ Mg>Na>Al $
C) $ Al>Mg>Na $
D) $ Mg>Al>Na $
Show Answer
Answer:
Correct Answer: D
Solution:
$ Mg>Al>Na $ . This is due to the presence of fully filled s-orbital in Mg.
