Question

which image depicts the ionic compound formed between calcium and sulfur? a. ca s b. ca s c. ca^{+2}s^{-2}

Explanation:

Step1: Understand ionic compound formation

Ionic compounds are formed by the transfer of electrons from a metal to a non - metal. Calcium (\(Ca\)) is a metal (Group 2 in the periodic table) and has 2 valence electrons. Sulfur (\(S\)) is a non - metal (Group 16 in the periodic table) and needs 2 electrons to complete its octet.

Step2: Analyze each option

• Option A: Shows the transfer of electrons (which is a part of the process of ionic bond formation), but does not represent the final ionic compound structure.
• Option B: Shows a covalent - like sharing of electrons representation (dots between \(Ca\) and \(S\)), which is incorrect for an ionic compound. Ionic compounds have electrostatic attraction between ions, not shared electrons.
• Option C: Represents \(Ca^{2+}\) (calcium loses 2 electrons) and \(S^{2 -}\) (sulfur gains 2 electrons) in the form of ions (\(Ca^{2+}[S]^{2-}\)), which is the correct representation of the ionic compound calcium sulfide (\(CaS\)).

Answer:

C.