pick the larger species from each pair.
a. Li or Li+
b. l- or Cs+
c. Cr or Cr3+
d. O or O2-
a. Li or Li+: Here Li is the larger species. Li has 3 electrons ( 2 on the same level, which is closer to the center of atom, and 1 on second level, outer ), when this atom looses this electron becomes Li+, now the power between protons and these 2 remaining electrons will be stronger, therefore the size will be smaller than Li.
b. l- or Cs+ : Here I- is the larger species ( greater the atomic no. greater the size).
c. Cr or Cr3+ : here Cr is the larger species (loss of electron decreses the size).
d. d. O or O2- : Here O2- is the larger species (addition of elctrons increases the size).
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