Multiple Choice
Which of the following represents a valid Lewis dot structure for the sodium ion (Na^+) and chloride ion (Cl^-) pair?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Ions
Multiple Choice
Which Lewis electron-dot diagram correctly represents calcium oxide (CaO)?
A
Ca [O]
B
[Ca]^{2+} [O]^{2-}
C
Ca^{2+} [ :O: ]^{2-}
D
Ca^{2+} [O]^{2-}
Verified step by step guidance1
Step 1: Identify the elements involved and their typical charges. Calcium (Ca) is an alkaline earth metal that commonly forms a +2 cation (Ca^{2+}), and oxygen (O) is a nonmetal that commonly forms a -2 anion (O^{2-}).
Step 2: Understand that calcium oxide (CaO) is an ionic compound formed by the transfer of electrons from calcium to oxygen, resulting in Ca^{2+} and O^{2-} ions.
Step 3: Recognize that the Lewis electron-dot diagram for Ca^{2+} will show no valence electrons around calcium because it has lost two electrons, while the O^{2-} ion will have a full octet represented by eight dots around the oxygen symbol.
Step 4: Compare the given options to see which correctly shows calcium as Ca^{2+} (no dots) and oxygen as O^{2-} with eight dots (representing the full octet) and the appropriate charge.
Step 5: Conclude that the correct Lewis electron-dot diagram for calcium oxide is the one that shows Ca^{2+} and [O]^{2-}, where calcium has no dots and oxygen has a full octet with a 2- charge.
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