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Solutions in liquid ammonia:


               They dissolve in liquid ammonia to give deep blue-black


               solutions forming ammoniated ions.


                              M+(x+y) NH   M(NH ) ]  +2[ e(NH ) ]                               _
                                                                        2+
                                                 3
                                                                   3  x
                                                                                          3  y

                              USES OF ALKALINE EARTH METALS

                     Cu-Be alloys are used in the preparation of high

                       strength springs.


                     Metallic Be is used for making windows of X-ray

                       tubes.

                     Mg-Al alloy is used in air-craft construction. Mg is


                       used in flash powders and bulbs, incendiary bombs

                       and signals.

                     A suspension of Mg (OH)  in water is used as antacid.
                                                               2
                       MgCO  is an ingredient of toothpaste.
                                 3
                     Ca is used in the extraction of metals from their

                       oxides.
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