Bond models

Question

Which descriptions could a student use to distinguish bond models? Select all that apply.

1. AAn ionic model can show electron transfer followed by attraction of opposite charges.✓ Correct

   Opposite charges attract after electron transfer in an ionic model.

2. BA covalent model can show an electron pair shared by bonded atoms.✓ Correct

   Sharing an electron pair is characteristic of covalent bonding.

3. CA metallic model can show outer electrons shared among many atoms.✓ Correct

   Metallic bonding involves outer electrons shared across many atoms.

4. DAn ionic model must show equal sharing by identical atoms.✗ Incorrect

   Equal sharing by like atoms describes a nonpolar covalent bond.

5. EA covalent model must show complete transfer without sharing.✗ Incorrect

   Complete transfer describes ionic bonding; covalent bonding involves sharing.

Answer

A. An ionic model can show electron transfer followed by attraction of opposite charges. · B. A covalent model can show an electron pair shared by bonded atoms. · C. A metallic model can show outer electrons shared among many atoms.

Rationale

Models of these bonds differ in what happens to electrons. Transfer and charge attraction characterize ionic bonding, while covalent and metallic bonding involve different patterns of sharing.