객관식
Which of the following represents the correct Lewis dot structure for the Ca^{2+} ion?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Ions
객관식
Which of the following best represents the Lewis dot structure for the ions in potassium sulfide (K2S)?
A
Each K atom gains one electron to form K^-, and the S atom loses two electrons to form S^{2+}.
B
Each K atom loses one electron to form K^+, and the S atom gains two electrons to form S^{2-}, resulting in [K^+] [K^+] [S^{2-}] with S having 8 valence electrons.
C
The S atom has 6 valence electrons and each K atom has 8 valence electrons in the final structure.
D
Each K atom shares one electron with S, forming two K–S single bonds.
검증된 단계별 안내1
Identify the correct charges on the ions in potassium sulfide (K2S). Potassium (K) is an alkali metal that typically loses one electron to form K^+, and sulfur (S) typically gains two electrons to form S^{2-}.
Determine the electron transfer: each K atom loses one electron, so two K atoms lose a total of two electrons, which are gained by the sulfur atom, resulting in K^+ and S^{2-} ions.
Draw the Lewis dot structures for the ions separately: K^+ ions have no valence electrons shown because they have lost their single valence electron, while S^{2-} has gained two electrons, completing its octet with 8 valence electrons.
Understand that in ionic compounds like K2S, electrons are transferred rather than shared, so there are no covalent bonds (no shared electron pairs) between K and S atoms; instead, the structure consists of K^+ and S^{2-} ions arranged in a lattice.
Conclude that the correct Lewis structure representation shows two K^+ ions without dots (since they lost their valence electrons) and one S^{2-} ion with 8 valence electrons (dots) around it, reflecting the full octet.
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