3rd quarter scientists

Identify the Scientists

Mendeleev 1. Father of the modern periodic table.

Empedocles 2. Asserted that all things are composed of four primal elements: earth, air, fire, and water.

Ernest Rutherford 3. Concluded that an atom is mostly an empty space.

James Chadwick 4. Proved the presence of neutral subatomic particles.

Robert Millikan 5. Asserted that an electron has a negative charge.

Joseph Proust 6. Proposed the law of definite proportions.

John Dalton 7. Formulated the atomic theory.

Niels Bohr 8. Proposed an atomic model that shows electrons move in concentric orbits around the nucleus.

Marie Curie 9. Conducted pioneering research on radioactivity.

Antoine Becquerel 10. Discovered radioactivity.

Aristotle 11. Proposed that all matter was continuous and could be further divided into infinitely smaller pieces

JJ Thompson 12. Suggested the plum pudding model of the atom.

Democritus 13. Proposed that all matter is made up of very small particles called atoms, which cannot be divided into smaller units.

Wilhelm Rontgen14. Discovered x-rays.

Henry Moseley15. Used X-ray spectra to study atomic structure.