Question

who was the first person to come up with the idea of the atom?
○ jj thomson
○ heisenberg
○ john dalton
○ democritus

Explanation:

To determine the first person to propose the idea of the atom, we analyze each option:

• JJ Thomson discovered the electron, not the initial atom concept.
• Heisenberg contributed to quantum mechanics (uncertainty principle), not the atom's initial idea.
• John Dalton developed modern atomic theory but wasn't the first to propose the atom concept.
• Democritus (ancient Greek philosopher) was the first to propose that matter is made of indivisible particles called atoms.

Answer:

D. Democritus