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First ionization enthalpies of four elements of zero group elements are given below
Element Ionization enthalpy in kJ/mole
A 1037
B 1520
C 1351
D 2372
Element Rn would be

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answer is A.

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Detailed Solution

Down the group I.P₁ decreases down the goup.

Increasing order of IP₁ is Rn < Xe < Kr < Ar < Ne < He

Lowest value among the given is A . A must be Rn

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