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

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
MCQ
The set representing the correct order of ionic radius is
  • A
    $Na^+ > Mg^{2+} > Al^{3+} > Li^+ > Be^{2+}$
  • ✓
    $Na^+ > Li^+ > Mg^{2+} > Al^{3+} > Be^{2+}$
  • C
    $Na^+ > Mg^{2+} > Li^+ > Al^{3+} > Be^{2+}$
  • D
    $Na^+ > Mg^{2+} > Li^+ > Be^{2+}$
✓

Answer

Correct option: B.
$Na^+ > Li^+ > Mg^{2+} > Al^{3+} > Be^{2+}$
b
The set representing the correct order of ionic radius is $N a^{+}>L i^{+}>M g^{2+}>A l^{3+}>B e^{2+}$.

In a period, on moving from left to right, the ionic radius decreases. Hence, $N a^{+}>M g^{2+}>A l^{3+}$ and $L i^{+}>B e^{2+}$

In a group, on moving down from top to bottom, the ionic radius increases. Hence, $N a^{+}>L i^{+}$ and $M g^{2+}>B e^{2+}$

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