Question

if an ionic compound has the chemical formula mg₃n₂, what are the charges of the magnesium and nitride ions respectively?
mg⁺, n⁻
mg²⁺, n³⁻
mg³⁺, n⁴⁻
mg²⁺, n²⁻
which of the following is the correct iupac name for the ionic compound with the chemical formula na₂s?
sodium(i) sulfide
sodium monosulfide
disodium sulfide
sodium sulfide
iron can form ions with charges of +2 and +3. what roman numeral is used

Explanation:

Step1: Determine charges in Mg₃N₂

Magnesium is in group 2 of the periodic table and loses 2 electrons to form a 2+ ion (Mg²⁺). Nitrogen is in group 15, gains 3 electrons to form a 3 - ion (N³⁻). In Mg₃N₂, to balance the charges, 3 Mg²⁺ (total +6 charge) and 2 N³⁻ (total - 6 charge) combine.

Step2: Name Na₂S

Sodium is a group 1 metal with a +1 charge and sulfur is a group 16 non - metal with a - 2 charge. In Na₂S, the cation is sodium and the anion is sulfide. According to IUPAC naming rules for ionic compounds, the name is sodium sulfide. We don't use prefixes for simple ionic compounds like this and we don't need to indicate the oxidation state of sodium as it has a fixed +1 oxidation state in its compounds.

Answer:

1. Mg²⁺, N³⁻
2. Sodium sulfide