What initially forms as pale blue and pale green precipitates when NH3(aq) is added to [Cu(H2O)6]2 and [Ni(H2O)6]2 solutions, respectively

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.