Early Ideas About Matter

Select all Essential Questions listed below.

• I don't know Mr. Long, I did not take notes!

• What are the similarities and differences of the atomic models of Democritus, Aristotle, and Dalton?

• How does the Law of Multiple Proportions relate to Dalton's Atomic Theory?

• How was Dalton’s theory used to explain the conservation of mass?

Who was the first to propose that matter was composed of tiny indivisible particles. His work was not based on experimental data.

• Democritus

• Dalton

• Rutherford

• Thomson

• Alchemist

Developed lab procedures but did not perform controlled experiments like true scientist.

• Aristotle

• Dalton

• Rutherford

• Thomson

• Alchemist

British school teacher, based his theory on experimental data. Developed the "billiard ball model" that stated atoms are a uniform solid sphere.

• Aristotle

• Dalton

• Rutherford

• Thomson

• Alchemist

All of the following are one of Dalton's Postulates except,,.

• Atoms of the same element are identical. Atoms of different elements are different.

• Atoms of different elements combine together

  in simple proportions to create a compound.

• In a chemical reaction, atoms are rearranged,

  but not changed.

• Elements are composed of small indivisible particles called atoms.

• A given chemical compound always contains the same elements in the exact same proportions by mass.

Discovered spontaneous emission of radiation from the nucleus.

• Thomson

• Rutherford

• Becquerel

• Bohr

• Schrödinger

He discovered electrons and proposed the "plum-pudding" model of the atom.

• Thomson

• Rutherford

• Becquerel

• Bohr

• Schrödinger

He discovered the nucleus and nuclear atom with the Gold Foil experiment.

• Thomson

• Rutherford

• Becquerel

• Bohr

• Schrödinger

Developed the Planetary Model, electrons move in circular orbits within specific energy levels.

• Thomson

• Rutherford

• Becquerel

• Bohr

• Schrödinger

Quantum Mechanical or Electron Cloud model, electron orbitals are regions around the nucleus where electrons are likely to be found.

• Thomson

• Rutherford

• Becquerel

• Bohr

• Schrödinger