Advanced Quiz on Identifying Element, Molecule, and Compound

This quiz tests classification on elements, molecules, and compounds by pushing questions into the advanced territory featuring allotropes with different bonding networks, giant covalent structures, discrete nanoscale molecules, metallic elements, and addition polymers. 

These often confuse students because of the "giant vs. discrete" distinction, metallic bonding, and polymeric nature.

Recall / Refine definitions for this level:

• Element: Only one type of atom.

• Molecule: Discrete group of ≥2 atoms covalently bonded (homoatomic or heteroatomic). Can be small like O₂ or large like C₆₀. 

• Compound: ≥2 different elements bonded (covalent/molecular or ionic/lattice).

• Network covalent / giant covalent solid: Continuous covalent bonding in 2D/3D lattice (e.g., diamond, graphite layers, SiO₂) — element or compound depending on atoms.

• Metallic solid: Metal atoms in lattice with delocalized electrons.

• Polymer: Long chain/macromolecule from repeating units (covalent within chain, usually intermolecular forces between chains).

Quiz format: Mix of multiple-choice (MCQ) and true/false (T/F). Some compare pairs directly.