2.1 History of the Atom

Who was the first person to come up with the Atomic Theory which included four parts.

• John Dalton

• Democritus

• Ernest Rutherford

• Niels Bohr

Who developed the Quantum Mechanical Model?

• Erwin Schrodinger
• Joseph Thomson
• James Chadwick
• Ernest Rutherford

Who discovered that the nucleus contains positively charged particles called protons?

• Ernest Rutherford
• James Chadwick
• Democritus
• Niels Bohr

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Who discovered the electron?

• Niels Bohr
• Democritus
• Joseph Thomson
• John Dalton

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

The central region of an atom where neutrons and protons are located is the __________________.

• nucleus 
• electron cloud
• core 
• center 

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Particles in an atom that are neutral and have no charge are 

• negatrons 
• electrons 
• neutrons 
• protons 

Matter always has mass.

• true
• false

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Worked with Rutherford to discover particles with no charge -- called neutrons.

• James Chadwick

• Niels Bohr

• Democritus

• Thomson

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Used the word "atomos" to decsribe the uncuttable (indivisible) atom.

• Democritus

• Thomson

• Bohr

• Dalton