Question
Chemistry Question on Classification of elements & periodicity in properties
Which of the following has maximum ionisation potential?
A
Na
B
K
C
Be
D
Mg
Answer
Be
Explanation
Solution
Alkali metals have lower ionisation potential than alkaline earth metals due to the extra nuclear charge in alkaline earth metals (which pulls e inwards). Also, Mg has got lower ionisation potential than Be as electron to be removed from Mg is present in one. shell outwards than in Be.