Question

who first used the word \atomos\ to describe the smallest unit of a substance?
thomson
democritus
bohr
schrödinger

Explanation:

The ancient Greek philosopher Democritus first used the word "atomos" to describe the smallest, indivisible unit of a substance. Thomson is known for the discovery of the electron, Bohr for the Bohr model of the atom, and Schrödinger for wave - mechanics in quantum theory.

Answer:

B. Democritus