MHT CET 2024 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties MHT CET 2024

Which from following elements has highest value of ionization enthalpy

(A)HeCorrect
(B)Ar
(C)Cl
(D)I

Answer: (A)

Solution

First ionisation enthalpy increases across a period and decreases down a group, because the effective nuclear charge rises across a period while the atomic size and shielding grow down a group. Noble gases have the highest values in their periods owing to their stable, filled configurations. Helium is

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Question ID VK-094898