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Which of the following atoms has the lowest ionization potential ?

  • Option 1)


  • Option 2)


  • Option 3)


  • Option 4)



Answers (1)


As we learnt in

Ionization energy -

E_{ion }= E_{\infty }-E_{n }



- wherein

Energy required to move an electron from ground state to n= \infty



_{55}^{133}Cs has the lowest ionization potential. Of the four atoms given, Cs has the largest size. Electrons in the outer most orbit are at large distance from nucleus in a large­size atom. Hence the ionization potential is the least.

Correct option is 2.

Option 1)


This is an incorrect option.

Option 2)


This is the correct option.

Option 3)


This is an incorrect option.

Option 4)


This is an incorrect option.

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