First slide

Size of nucleus

Question

Which of the following atoms has the lowest ionization potential?

Moderate

A

$_{8} {O_{}}^{16}$
B

${_{7} N_{}}^{14}$
C

${_{55} {Cs}_{}}^{133}$
D

${_{18} {Ar}_{}}^{40}$

Solution

Since the $[_{55} {Cs}_{}^{133}]$ has larger size among the four atoms gives, thus the electrons present in the outermost orbit will be away from the nucleus and the electrostatic force experienced by electrons due to nucleus will be minimum. Therefore, the energy required to liberate electron from outer will be minimum in the case of ${_{55} {Cs}_{}}^{133}$

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