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Question
Which from following is a CORRECT decreasing order of ionization enthalpies of different elements?
Options
Ar > Kr > Br > Se
Kr > Br > Ar > Se
Kr > Ar > Se > Br
Se > Br > Kr > Ar
MCQ
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Solution
Ar > Kr > Br > Se
Explanation:
The ionization enthalpy decreases down the group due to increase in the atomic size.
Therefore, ionization enthalpy of Ar is more than that of Kr.
Across a period ionization enthalpy increases with increase of atomic number.
Therefore, ionization enthalpy of Se, Br and Kr is in the order: Se < Br < Kr.
Hence, the correct decreasing order of ionization enthalpy for the given elements is:
Ar > Kr > Br > Se
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