Questions
Which of the following species have incorrect order of size?
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a
O2−>O->F⊖>F
b
O⊖>O2−>F⊖>F
c
O2−>F⊖>O⊖>F
d
O2−>F⊖>F>O⊖
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Correct option is B
They are not isoelectronic species. Size of O > size of F, along the 2nd period (→) size decreases. Size of more negatively charged ion is greater than less negatively charged ion and size of neutral atom is greater than positively charged ion. Hence the order isO2−>O⊖>F⊖>F
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The lanthanoid contraction is responsible for the fact that
(Atomic numbers: Zr = 40, Y = 39, Nb = 41, Hf = 72, Zn = 30)
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