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Q.

Which one of the following relations is correct with respect to first (I) and second (II) ionisation potentials of Na and Mg?

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a

INa>IMg

b

IMg=IINa

c

IIMg>IINa

d

IINa>IIMg

answer is D.

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Detailed Solution

We know that 

Electronic configuration of Na=1 s22 s22p63 s1

Electronic configuration of Mg=1 s22 s22p63 s2

 And, Ist Ionization energy of sodium will be less than magnesium.

As we move across the period, the number of valence electrons in an atom increases and also nuclear charge increases which tend to decrease the radius and ionisation energy increases.

When an electron is removed from Na, it acquires a noble gas configuration which is more stable and removing electrons requires more energy.

> Na Mg


 

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