Multiple Choice
Which of the following is the most stable monatomic ion formed from iodine?
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2. Atoms & Elements
Ions
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Which pair of ions would experience an electrostatic force of attraction between them?
A
Mg^2+ and Al^3+
B
K^+ and Ca^2+
C
Na^+ and Cl^-
D
Br^- and I^-
Verified step by step guidance1
Recall that electrostatic force of attraction occurs between ions of opposite charges (cations and anions).
Identify the charge on each ion in the given pairs: Mg^{2+} (cation) and Al^{3+} (cation), K^{+} (cation) and Ca^{2+} (cation), Na^{+} (cation) and Cl^{-} (anion), Br^{-} (anion) and I^{-} (anion).
Determine which pairs consist of one positively charged ion (cation) and one negatively charged ion (anion), since only these pairs attract each other.
Recognize that Na^{+} and Cl^{-} form a cation-anion pair, so they experience an electrostatic force of attraction.
Conclude that pairs like Mg^{2+} and Al^{3+} or Br^{-} and I^{-} do not attract because they have the same charge, and K^{+} and Ca^{2+} are both cations, so no attraction occurs.
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