Final answer:
The compound formed from a tight network of oppositely charged ions is salt, NaCl. It is an ionic compound with a neutral overall charge due to the balanced number of electrons transferred between cations and anions.
Step-by-step explanation:
The compound formed from a tight network of oppositely charged ions is salt, NaCl. Ionic compounds such as salt are made up of positively charged ions (cations) and negatively charged ions (anions) that are attracted to each other and form a crystalline structure. This structure results in a compound that has a neutral overall charge because the number of electrons lost by the cations is equal to the number of electrons gained by the anions, a principle also required by the law of conservation of matter.
Examples like quartz, SiO2, are made up of giant molecules with a 3D network of bonds, but these are not formed from a network of ions. Sugar, C12H22O11, is a molecular compound held together by intermolecular forces rather than ionic bonds, and water, H2O, is a covalent compound.
Therefore, the correct answer to the question is option D: salt, NaCl.