1.

Which of the following has maximum ionisation potential?(a) Na(b) K(c) Be(d) Mg

Answer»

Correct option (c) Be

Explanation:

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 lower ionisation potential than Be as electron to be removed from Mg is present in one shell outwards than in Be.



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