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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Increasing order of atomic radii is
  • ✓
    $M{g^{2 + }} < N{a^ + } < Ne < {F^ - } < {O^{2 - }}$
  • B
    $N{a^ + } < M{g^{ + + }} < Ne < {F^ - } < {O^{2 - }}$
  • C
    ${O^{2 - }} < {F^ - } < Ne < N{a^ + } < M{g^{2 + }}$
  • D
    $Ne < {O^{2 - }} < {F^ - } < N{a^ + } < M{g^{2 + }}$
✓

Answer

Correct option: A.
$M{g^{2 + }} < N{a^ + } < Ne < {F^ - } < {O^{2 - }}$
a
All the species are iso-electronic $\left(10 e ^{-}\right)$

For iso-electronic species more the positive change, smaller the ionic radii.

For iso-electronic species more negative change, bigger the ionic radii

Hence the order is $Mg ^{2+}\,<\, Na ^{+}\,<\, F ^{-}\,<\, O ^{2-}$

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