Classification Of Elements And Periodicity In Properties Question 3
Question: The incorrect statement among the following is [IIT-JEE 1997]
Options:
A) The first ionisation potential of $ Al $ is less than the first ionisation potential of $ Mg $
B) The second ionisation potential of $ Mg $ is greater than the second ionisation potential of $ Na $
C) The first ionisation potential of $ Na $ is less than the first ionisation potential of $ Mg $
D) The third ionisation potential of $ Mg $ is greater than the third ionisation potential of $ Al $
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Answer:
Correct Answer: B
Solution:
I.E.(II) of $ Na $ is higher than that of $ Mg $ because in case of $ Na $ , the second $ {{e}^{-}} $ has to be remove from the noble gas core while in case of $ Mg $ removal of second $ {{e}^{-}} $ gives a noble gas core. $ Mg $ has high first ionisation potential than $ Na $ because of its stable $ ns^{2} $ configuration.
BETA
