Question

select the correct answer. who was the first to state the concept of an atom? a. niels bohr b. john dalton c. ernest rutherford d. democritus

Explanation:

Democritus was an ancient Greek philosopher who first proposed the concept of an atom. He suggested that matter is made up of tiny, indivisible particles called atoms. John Dalton is known for his modern - atomic theory in the 19th century. Ernest Rutherford is famous for his gold - foil experiment and discovery of the atomic nucleus. Niels Bohr proposed a model of the atom with electrons in quantized orbits. But Democritus was the first to state the concept of an atom.

Answer:

A. Democritus