Indivisible particle of matter in ancient philosophy.

Fundamental unit of a chemical element.

Smallest unit retaining properties of an element.

Basic building block in molecular structure studies.

Conceptual representation in atomic theory discussions.

Indivisible; cannot be divided further.

Tiny or minute in size.

Fundamental; essential to composition of matter.

Atomic level; relating to atoms specifically.

Unbreakable or inseparable in context or nature.