History of the Atom

Who discovered the atom's electrons?

• Robert Millikan

• JJ Thomson

• Ernst Rutherford

• Niels Bohr

Who was the first person to come up with the Atomic Theory?

• John Dalton
• Democritus
• Ernest Rutherford
• Niels Bohr

What is Niels Bohr responsible for discovering?

• That electrons are inside the nucleus
• That electrons are in fixed orbits around the nucleus
• That electrons are small
• That electrons are negative

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

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Which model involved gold foil?

• Thomson Model
• Rutherford Model
• Cloud Model
• Bohr Model

The nucleus is made up of protons and what other particle?

• Electrons
• Nothing else
• Neutrons
• Atomic Number

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What did James Chadwick discover?

• neutrons
• electrons
• the atomic theory
• protons

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an atom with atomic number 6 would have how many protons 

• 6
• 12
• 3
• cannot be determined 

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Which statement best describes an electron?

• Smaller mass than a proton and a negative charge
• Smaller mass than a proton and a positive charge
• Greater mass than a proton and a negative charge
• Greater mass than a proton and a positive charge

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Who coined the term "atomos"?

• Aristotle
• Socrates
• Democritus
• Dalton