1. Barium Chloride
* Barium (Ba): Barium is in group 2 of the periodic table, meaning it has a +2 charge (Ba²⁺).
* Chloride (Cl): Chlorine is in group 17, meaning it has a -1 charge (Cl⁻).
To balance the charges, we need two chloride ions for every barium ion. Therefore, the formula for barium chloride is BaCl₂.
2. Sodium Chromate
* Sodium (Na): Sodium is in group 1, meaning it has a +1 charge (Na⁺).
* Chromate (CrO₄): Chromate is a polyatomic ion with a -2 charge (CrO₄²⁻).
To balance the charges, we need two sodium ions for every chromate ion. Therefore, the formula for sodium chromate is Na₂CrO₄.
