[PDF] ammoniaque (alcali) - Kaliptis

How do alkali metals react with ammonia?

The alkali metals dissolve slowly in liquid ammonia, forming ammoniacal solutions of solvated metal cation M + and solvated electron e ?, which react to form hydrogen gas and the alkali metal amide (MNH 2, where M represents an alkali metal): this was first noted by Humphry Davy in 1809 and rediscovered by W. Weyl in 1864.

Are alkali metal stannides ionic?

:?393 Alkali metal stannides are mostly ionic, sometimes with the stannide ion ( Sn 4? ), and sometimes with more complex Zintl ions such as Sn4? 9, which appears in tetrapotassium nonastannide (K 4 Sn 9 ).

Are ammonium ions toxic?

Ammonium ions are a toxic waste product of metabolism in animals. In fish and aquatic invertebrates, it is excreted directly into the water. In mammals, sharks, and amphibians, it is converted in the urea cycle to urea, which is less toxic and can be stored more efficiently.