Class 11 Chemistry The S Block Elements Similarity of lithium with magnesium

Similarity of lithium with magnesium

  • Lithium and magnesium have similar atomic and ionic radii and hence exhibit similar properties.

Atomic radii

Li = 152 pm,
Mg = 160 pm;

Ionic radii

Li+ = 76 pm,
Mg2+= 72 pm.

  • Both the elements are harder and lighter than the other elements.
  • Both of them react slowly with
  • The oxides and hydroxides of both the elements are less soluble.
  • The hydroxides of both the elements decompose on heating.
  • Both the elements form nitrides by combining directly with nitrogen.

6 Li+ N2 (g) = 2 Li3N

3 Mg(s) + N2 (g) = Mg3N2(s)

  • Both Li2O and MgO do not produce their superoxide by combining with excess oxygen.
  • Chlorides of both lithium (LiCl) and magnesium (MgCl2) are soluble in ethanol, are deliquescent and crystallize as hydrates.

LiCl·2H2O

MgCl2·8H2O

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