Pick the pair that hasthe lowest (easiest to ionize) ionization energy and the m

Question

Pick the pair that hasthe lowest (easiest to ionize) ionization energy and the most
endothermic (most difficult to attach an electron) electronaffinity.

      LowestI.E.    Most endothermic E.A.
A.       Cs                        O

B.       O                         Na
C.      Na                          F

D.      Na                         O

E.      Cs                         Mg
Please explain why in details ? Pick the pair that hasthe lowest (easiest to ionize) ionization energy and the most
endothermic (most difficult to attach an electron) electronaffinity.

      LowestI.E.    Most endothermic E.A.
A.       Cs                        O

B.       O                         Na
C.      Na                          F

D.      Na                         O

E.      Cs                         Mg
Please explain why in details ?
Please explain why in details ?
Please explain why in details ?

Explanation / Answer

Ionization energy is the energy required to remove theoutermost electron in the atom or molecule when the gas atom ormolecule is isolated in free space and is in its ground electronicstate. On going from top to bottom in a group the size increases , soit is easier to remove the outer most electron.Therefore form topto bottom ionization energy increases.But it is quite revese whenapplied to the rows.i.e., when we are going from left to right in aperiod the atomic radius decreases, ionization energyincreases.
Electron affinity is the measure of the energy change when anelectron is added to a neutral atom to form a negative ion. So O having more electron affinity among all. So the answer is A

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