Predict whether each of the following reactions will occur in aqueous solutions. explain your reasoning in each case. note: barium sulfate and silver bromide precipitate in aqueous solutions.
(a) sodium hydroxide + ammonium sulfate → ?
(b) niobium(v) sulfate + barium nitrate → ?
(c) strontium bromide + silver nitrate → ?

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

a) sodium hydroxide + ammonium sulfate :

b) niobium(V) sulfate + barium nitrate:

c) strontium bromide + silver nitrate:

sry but any answer choices

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.