1.

(i) For each of the following pairs, predict which one has greater ionization energy and greater electron affinity ? (a) 1,1– (b) B, C (c) Li, Li+(ii) Select the correct order of radii of three species : Ca, Ca+ and Ca2+ : (a) Ca > Ca+ > Ca2+  (b) Ca2+ > Ca+ > Ca (c) Ca+ > Ca > Ca2+  (d) Ca+ > Ca2+ > CaAssign suitable reason.

Answer»
Ionisation EnergyElectron affinity
(a) I- > I(i) I > I-
(b) C > B(ii) C > B
(c) Li+ > Li(iii) Li  > Li+

(ii) The correct order of radii is (a), i.e., Ca > Ca+ > Ca2+ .

 This is because due to the loss of electron, the effective nuclear charge per electron increases, the electrons are more strongly attracted and pulled towards the nucleus. This causes a decrease in the size of the positive ion.


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