Metallic Bonding Model Error

Steps:

• Recall metallic structure: lattice of positive ions in a "sea" of delocalized electrons.
• Check statement 1: it incorrectly states "negative ions" instead of positive ions.
• Verify statement 2: electrical conductivity indeed arises from mobile delocalized electrons.
• Conclude option D matches: statement 2 correct, statement 1 incorrect.

Why D is correct:

• Metallic bonding definition requires positive cations in an electron sea for structure and properties like conductivity.

Why the others are wrong:

• A: Incorrect as statement 1 is false, so it cannot explain statement 2.
• B: Incorrect as statement 1 is false.
• C: Incorrect as statement 2 is true.

Final answer: D