Which pair of ions can form an ionic bond with each other and why?
A. [tex]Cu ^{+}[/tex] and [tex]Ag ^{+}[/tex]; They are both metal ions.
B. [tex]S ^{2-}[/tex] and [tex]O ^{2-}[/tex]; They have like charges.
C. [tex]Br ^{-}[/tex] and [tex]At ^{-}[/tex]; They are both halogen ions.
D. [tex]Li ^{+}[/tex] and [tex]Br ^{-}[/tex]; They have unlike charges.
Answer (2)
Ionic bonds form between oppositely charged ions.
C u + and A g + are both positive and repel.
S 2 − and O 2 − are both negative and repel.
B r − and A t − are both negative and repel.
L i + and B r − have opposite charges and attract, forming an ionic bond: L i + an d B r − .
Explanation
Understanding Ionic Bonds We are asked to identify which pair of ions can form an ionic bond. Ionic bonds are formed through the electrostatic attraction between oppositely charged ions. We need to examine each option to determine if the ions have opposite charges.
Analyzing Each Option Let's analyze each option:
Option 1: C u + and A g + are both positively charged metal ions. Since they have the same charge, they will repel each other and not form an ionic bond.
Option 2: S 2 − and O 2 − are both negatively charged ions. They will also repel each other.
Option 3: B r − and A t − are both negatively charged halogen ions. They will repel each other as well.
Option 4: L i + is a positively charged ion, and B r − is a negatively charged ion. These ions have opposite charges and will attract each other to form an ionic bond.
Conclusion Therefore, the pair of ions that can form an ionic bond is L i + and B r − , because they have unlike charges.
Examples
Ionic bonds are crucial in many real-world applications. For instance, table salt (NaCl) is formed through an ionic bond between sodium (Na+) and chloride (Cl-) ions. This bond gives salt its crystalline structure and properties. Similarly, many minerals and compounds in our bodies rely on ionic bonds for stability and function. Understanding ionic bonds helps us comprehend the properties of various materials and their interactions.
The pair of ions that can form an ionic bond is L i + and B r − , as they have opposite charges. The other options consist of ions with like charges that repel each other and cannot bond. This illustrates the principle that ionic bonds form between oppositely charged ions due to their electrostatic attraction.
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