Question

how many valence electrons are lost by the metallic element when forming the ionic compound bas?
○ 1
○ 3
○ 2
○ 4

Explanation:

Step1: Analyze the ionic compound

In an ionic compound, the charges of the ions balance each other. Barium (Ba) is the metallic element. Sulfur (S) in ionic compounds typically gains 2 electrons to form \(S^{2 -}\) ion.

Step2: Determine the charge of barium ion

For the compound BaS to be neutral, since sulfur has a charge of - 2, barium must have a charge of + 2.

Step3: Relate charge to valence electrons lost

The charge of an ion is related to the number of valence electrons lost (for metals). A \(Ba^{2+}\) ion means 2 valence electrons are lost.

Answer:

2