The cation is Na+.
Bromide (Br-): Sodium reacts with bromide (derived from bromine) to form sodium bromide. The cation is Na+, the anion is Br-. The formula of the ionic compound formed from sodium cation and bromide is NaBr.
Hydroxide (OH-): Sodium reacts with hydroxide (derived from hydrogen and oxygen) to form sodium hydroxide. The cation is Na+, the anion is OH-. The formula of the ionic compound formed from sodium cation and hydroxide ion is NaOH.
Hydrogen carbonate (HCO3-): Sodium reacts with hydrogen carbonate (derived from hydrogen, carbon and oxygen) to form sodium bicarbonate. The cation is Na+, the anion is HCO3-. The formula of the ionic compound formed from sodium cation and hydrogen carbonate ion is NaHCO3.
Sulfite (SO32-): Sodium reacts with sulfite (derived from sulfur and oxygen) to form sodium sulfite. The cation is Na+, the anion is SO32-. The formula of the ionic compound formed from sodium cation and sulfite ion is Na2SO3.
Phosphate (PO43-): Sodium reacts with phosphate (derived from phosphorus and oxygen) to form sodium phosphate. The cation is Na+, the anion is PO43-. The formula of the ionic compound formed from sodium cation and phosphate ion is Na3PO4.
The cation is Co2+.
Bromide (Br-): Cobalt reacts with bromide (derived from bromine) to form cobalt (II) bromide. The cation is Co2+, the anion is Br-. The formula of the ionic compound formed from cobalt cation and bromide is CoBr2.
Hydroxide (OH-): Cobalt reacts with hydroxide (derived from hydrogen and oxygen) to form cobalt (II) hydroxide. The cation is Co2+, the anion is OH-. The formula of the ionic compound formed from cobalt cation and hydroxide ion is Co(OH)2.
Hydrogen carbonate (HCO3-): Cobalt reacts with hydrogen carbonate (derived from hydrogen, carbon and oxygen) to form cobalt (II) bicarbonate. The cation is Co2+, the anion is HCO3-. The formula of the ionic compound formed from cobalt cation and hydrogen carbonate ion is Co(HCO3)2.
Sulfite (SO32-): Cobalt reacts with sulfite (derived from sulfur and oxygen) to form cobalt (II) sulfite. The cation is Co2+, the anion is SO32-. The formula of the ionic compound formed from cobalt cation and sulfite ion is CoSO3.
Phosphate (PO43-): Cobalt reacts with phosphate (derived from phosphorus and oxygen) to form cobalt (II) phosphate. The cation is Co2+, the anion is PO43-. The formula of the ionic compound formed from cobalt cation and phosphate ion is Co3(PO4)2.
The cation is Al3+.
Bromide (Br-): Aluminum reacts with bromide (derived from bromine) to form aluminum bromide. The cation is Al3+, the anion is Br-. The formula of the ionic compound formed from aluminum cation and bromide is AlBr3.
Hydroxide (OH-): Aluminum reacts with hydroxide (derived from hydrogen and oxygen) to form aluminum hydroxide. The cation is Al3+, the anion is OH-. The formula of the ionic compound formed from aluminum cation and hydroxide ion is Al(OH)3.
Hydrogen carbonate (HCO3-): Aluminum reacts with hydrogen carbonate (derived from hydrogen, carbon and oxygen) to form aluminum bicarbonate. The cation is Al3+, the anion is HCO3-. The formula of the ionic compound formed from aluminum cation and hydrogen carbonate ion is Al(HCO3)3.
Sulfite (SO32-): Aluminum reacts with sulfite (derived from sulfur and oxygen) to form aluminum sulfite. The cation is Al3+, the anion is SO32-. The formula of the ionic compound formed from aluminum cation and sulfite ion is Al2(SO3)3.
Phosphate (PO43-): Aluminum reacts with phosphate (derived from phosphorus and oxygen) to form aluminum phosphate. The cation is Al3+, the anion is PO43-. The formula of the ionic compound formed from aluminum cation and phosphate ion is AlPO4.
The figure below shows the complete table by filling in the formula of the ionic compound from the cations and anions is,
Figure 1