Modern Atomic Theory

The observations of who led us to the law of definite proportions?

• Dalton

• Thomson

• Rutherford

• Bohr

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112.35.c.6.A

Who discovered the electron in the cathode-ray tube experiment?

• Dalton

• Thomson

• Rutherford

• Bohr

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112.35.c.6.A

Match the following atomic model to its scientist

• Rutherford

• 
• Thomson

• 
• Bohr

• 
• Dalton

• 

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112.35.c.6.A

Ernest Rutherford discovered that the atom has a small, dense, and positive center called the what?

• electron

• orbital

• isotope

• nucleus

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112.35.c.6.A

What is the main difference between the Rutherford and Bohr atomic models?

• There are no electrons in the Rutherford model

• There is no nucleus in the Rutherford model

• Electrons surround the nucleus in specific energy levels in the Bohr model

• There are no electrons in the Bohr model

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112.35.c.6.A

Order the following atomic models from oldest to most current:

• Dalton

• Thomson

• Rutherford

• Bohr

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112.35.c.6.A

J.J. Thomson discovered in his cathode-ray tube experiment that electrons have what kind of charge?

• positive

• negative

• neutral

Answer explanation

Because the ray was attracted towards the positively charged metal plate, J.J. Thomson discovered that electrons have a negative charge

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112.35.c.6.A

The main ideas behind John Dalton's atomic model were what?

• electrons surround the nucleus in specific energy levels

• the atom is indivisible can't be divided into smaller parts

• the atom is mostly empty space with a dense and positive nucleus

• electrons are located inside a positive sea of the atom

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112.35.c.6.A

What did the discovery of the electron help us to understand?

• The atom is made up of smaller particles

• The atom is mostly empty space

• The atom is positively charged

• Gravitational forces are at work in the atom

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112.35.c.6.A

Why has our model of the atom changed over time?

• Scientists are becoming better at guessing models as time passes

• Increased spiritual prayer and revelation has given us this data

• new data has become available through experiments and observation

• Popular social media influencers on YouTube and Instagram are informing the public

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112.35.c.6.A