Timeline of the Atomic Model

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. What model is this?

• 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

The Gold foil experiment was conducted by Ernest Rutherford. In the experiment, he discovered that atoms were mostly _________________. 

• negatively charged
• positively charged
• electrons
• empty space. 

Who is the British physicist who discovered the electron using cathode ray tube?

• Joseph John Thomson

• John Dalton
• Ernest Rutherford
• Robert Millikan

What contribution did John Dalton make to atomic theory? 

• He discovered that every atom was positively charged. 
• He discovered that every element consisted of one type of atom.  
• He discovered that atoms had nuclei. 
• He discovered that atoms could be divided into smaller parts. 

Who did not propose a complete atomic model but, through his famous oil drop experiment in 1913 but he accurately measured the mass and charge of an electron?

• Joseph Thomson
• Robert Millikan
• John Dalton
• Niels Bohr

Using the figure, what did Rutherford concluded about the atom?

• has a nucleus with a positive charge
• has a nucleus with a negative charge 
• is a small mass with negative and positive charges
• contains a nucleus without a charge

He determined the mass of an electron and confirmed it’s charge in 1909 as a result of oil drop experiments.

• Thompson
• Chadwick
• Millikan
• Democritus

What is the Law of Conservation of mass?

• Mass is created in a chemical reaction
• Mass is created in a physical change
• New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
• Mass is never created or destroyed

The basic principles of the atomic theory that are still recognized today were first conceived by?

• Avogadro

• Bohr

• Dalton

• Rutherford

What did Robert Millikan's experiments determined?

• That the electron carried no charge

• That the electron carried the smallest possible positive charge

• The approximate value of the electron's mass

• That the electron had no mass