Question

Classify each solid as a covalent, ionic, metallic, or molecular solid? Diamond, frozen carbon dioxide, pure sodium, and sodium sulfide

Answer 1

Diamond possesses a NON-MOLECULAR covalent network.

Explanation:

`CO_2(s)` is molecular, with the individual molecules held together by (weak) dispersion forces.

Sodium exhibits metallic bonding; i.e. positive ions in an electron sea, which gives rise to demonstrable malleability and ductility. (You can deform sodium metal with gloved hands!). Note that sodium, like all metals, is a NON-MOLECULAR material.

And sodium sulfide is also non-molecular, ionic solid composed of individual `2xxNa^+` and `S^(2-)` ions held together by strong electrostatic interaction between the positive and negative ions.