The vertical columns on the periodic table of elements are called periods
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According to Arrhenius definition of acids, is an acid.
According to Arrhenius definition of acids and bases, acid is any substance that produces hydrogen ion in solution as its only positive ion.
Following this definition, let us now consider what happens when is introduced into a water;
(aq)-------> NH3(aq) +
(aq)
Hence, according to Arrhenius definition of acids, is an acid.
For another example of Arrhenius acids, see