Evaluating statements on element structures and melting points

Steps:

• Statement 1 is incorrect: Giant structures like metals and diamond have high melting points, but the table likely shows exceptions, such as some giant metallic structures with lower melting points than simple molecular ones like iodine.
• Statement 2 is correct: Magnesium (Group 2) contributes 2 valence electrons to delocalized sea, creating stronger electrostatic forces than sodium (Group 1) with 1 electron, raising its melting point.
• Statement 3 is correct: Phosphorus (P4) and sulfur (S8) form simple molecular lattices with weak van der Waals forces between molecules, preventing charge carrier movement for electrical conduction.
• Thus, only statements 2 and 3 hold true, selecting option D.

Why D is correct:

• It accurately identifies statements 2 and 3 as true based on metallic bonding strength and molecular structure definitions.

Why the others are wrong:

• A includes incorrect statement 1.
• B includes incorrect statement 1.
• C excludes correct statement 2.

Final answer: D