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Q.

Which of the following has the largest ionization energy?


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a

Cl

b

Br

c

Se

d

All of them 

answer is A.

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Detailed Solution

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Cl has the largest ionization energy among the following.
Ionization energy is the amount of energy required to eject an electron from the outermost orbit of the atom. Among the given atoms, chlorine will have the lowest ionization energy due to its smaller size. Since the size of the chlorine is small, hence the energy required to remove an electron from it will be more and hence the largest ionization energy.
 
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