Question

who used scientific investigations to study atoms? check all that apply. dalton democritus rutherford thomson done

Explanation:

• Dalton: John Dalton proposed an atomic theory based on scientific investigations like studying gas laws and chemical reactions. His theory had postulates about atoms being indivisible (though later modified) and elements consisting of identical atoms.
• Rutherford: Ernest Rutherford conducted the gold - foil experiment (a scientific investigation). From the results (most alpha particles passing through, some deflected, and a few bouncing back), he proposed the nuclear model of the atom.
• Thomson: J.J. Thomson did experiments with cathode - ray tubes (a scientific method). He discovered electrons and proposed the plum - pudding model of the atom.

Democritus was a Greek philosopher. He proposed the concept of atoms based on philosophical reasoning (e.g., if you keep cutting matter, you'll reach an indivisible particle - atom) rather than scientific investigations in the modern sense (like experiments, data collection, and analysis).

Answer:

Dalton, Rutherford, Thomson.