History of the Atomic Model

Match the following

• John Dalton

• Describes mathematically the wave properties of electrons.

• Quantum Theory

• In 1803, proposed the atomic theory of matter.

• Democritus

• Proposed that all matter is made up of tiny indivisible particles called atoms.

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Match the following

• Niels Bohr

• Concluded the atom had negatively charged particles that he named electrons. Proposed the Plum-Pudding Model of the atom.

• Ernest Rutherford

• From his Gold Foil Experiment, he concluded that the atom is mostly empty space with a tiny, positively charged, dense center he called the nucleus.

• J. J. Thomson

• Proposed a model of the atom in which electrons travel around the nucleus in orbits.

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What did Rutherford conclude from his experiment?

• Atoms are a dense, solid sphere.

• Atoms are a dense sphere filled with gases.

• Atoms are mostly empty space with a dense positively charged center.

• Atoms are mostly empty space with electrons, protons, and neutrons in the center.

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Which of the following points was included in Dalton's atomic theory, but later found to be not true?

• All matter is composed of atoms.

• Atoms of a given element are identical.

• Atoms of different elements combine to form compounds.

• In chemical reactions, atoms are separated, rearranged, or combined.

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Which scientist, or scientists, are credited with the development of the current Quantum Mechanical Model of the atom?

• Bohr

• Democritus

• Millikan

• many scientists

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How does the current Quantum Model differ from the Bohr Model?

• The Quantum Model show a dense, solid atom, and Bohr's model shows an empty space atom.

• In Bohr's model, the electrons are in the nucleus, and in the Quantum Model electrons are outside the nucleus.

• The Quantum Model agrees with Bohr's model, except that the orbits are further apart.

• The Quantum Model has an electron cloud, and Bohr's model shows electrons in orbits around the nucleus.

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Match the following images to the correct atomic model name.

• Billiard Ball Model

• 
• Quantum Mechanical Model

• 
• Plum Pudding Model

• 
• Rutherford Model

• 
• Bohr Model

• 

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