4.2-4.5 Atomic Models and Atomic Structure

This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces.

• Democritus's model of the atom
• The "Plum Pudding Model" of the atom
• The "Rutherford Model" of the atom
• The "Quantum Mechanical Model" of the atom

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This is the most complete and current model of the atom. It consists of 61 elementary particles. Electrons are located in complex orbitals.

• The "Quantum Mechanical Model" of the atom
• The "Rutherford Model" of the atom
• The "Plum Pudding Model" of the atom
• The "Bohr Model" of the atom

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This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. Is shows electrons floating freely in a positive space.

• The "Plum Pudding Model" of the atom
• The "Rutherford Model" of the atom
• Democritus's model of the atom
• The "Quantum Mechanical Model" of the atom

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In the gold foil experiment, most of the positively charged alpha particles passed through the gold foil, but some were deflected or bounced back.  What did we conclude because of this?  

• Atoms are small indivisible spheres
• Atoms are mostly empty space with a small, dense, positive center
• Atoms have negatively charged particles which orbit the nucleus
• Light is a wave, not a particle

Discovered the electron using cathode ray tube

• Joseph Thomson
• John Dalton
• Ernest Rutherford
• Robert Millikan

His atomic model included a dense positive core in an atom, surrounded by negatively charged particles

• Joseph Thomson
• Niels Bohr
• Ernest Rutherford

Discovered the nucleus

• Democritus
• Robert Millikan
• James Chadwick
• Ernest Rutherford

One of the Dalton's conclusions concerning his atomic theory was that all the atoms of the same element are ___.

• the same
• different
• combined
• reacted

These particles have a mass of 1 amu

• protons and neutrons
• protons and electrons
• neutrons and electrons

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What is the name of this element?

• Lithium
• Boron
• Carbon
• Neon

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