1.3 The development of the model of the atom

• Dalton's atomic model proposed that atoms are indivisible, solid spheres
• Thomson's plum pudding model could explain the results of Rutherford's gold foil experiment

  False
• What was a key feature of Dalton's atomic model?

  Atoms are indivisible spheres
• Order the development of atomic models chronologically

  1️⃣ Dalton's atomic model

  2️⃣ Thomson's plum pudding model

  3️⃣ Rutherford's nuclear model
• Rutherford's nuclear model was the first to propose the existence of electrons

  False
• In Thomson's plum pudding model, atoms have a positively charged "pudding" with embedded negatively charged electrons
• Dalton's atomic model proposed that atoms are the smallest, unchangeable particles of matter
• Order the development of atomic models from earliest to latest:

  1️⃣ Dalton's atomic model

  2️⃣ Thomson's plum pudding model

  3️⃣ Rutherford's nuclear model
• Match the atomic model with its limitation:

  Dalton's model ↔️ Could not explain subatomic particles

  Thomson's model ↔️ Could not explain gold foil experiment
• What key feature did Bohr's model introduce to atomic theory?

  Quantized energy levels
• Bohr's model explained why atoms don't collapse and emit specific wavelengths of light.


  True
• Rutherford's nuclear model proposed that positive charge is concentrated in the nucleus
• What was the key improvement of Thomson's plum pudding model over Dalton's atomic model?

  Recognition of subatomic particles
• Dalton's atomic model could explain the discovery of subatomic particles.

  False
• Bohr's model addressed limitations of previous models by explaining atomic stability and the emission/absorption of specific wavelengths of light
• What does the wave-particle duality in quantum mechanics describe?

  Particles exhibit wave properties
• Thomson's plum pudding model proposed that atoms have a positively charged "pudding" with embedded electrons
• Rutherford's nuclear model could explain the results of the gold foil experiment


  True
• What was a key feature of Rutherford's nuclear model?

  Concentrated positive nucleus
• What experimental evidence led to the rejection of Thomson's plum pudding model?

  Rutherford's gold foil experiment
• What did Rutherford's gold foil experiment demonstrate about the structure of atoms?

  Atoms have a nucleus
• What experiment led to the development of Rutherford's nuclear model of the atom?

  Gold foil experiment
• Thomson's plum pudding model recognized that atoms contain subatomic particles.


  True
• What limitation did Dalton's atomic model address?

  Discovery of subatomic particles
• Order the postulates of Bohr's atomic model based on their significance:

  1️⃣ Electrons exist in quantized energy levels

  2️⃣ Electrons can only occupy discrete orbits

  3️⃣ Photon emitted/absorbed during level transitions
• Dalton's atomic model proposed that atoms are indivisible, solid spheres
• What is the structure of the atom according to Rutherford's nuclear model?

  Dense nucleus with orbiting electrons
• Match the atomic model with its key limitation:

  Dalton's model ↔️ Cannot explain subatomic particles

  Thomson's model ↔️ Fails to explain gold foil experiment

  Rutherford's model ↔️ Does not explain stable orbits
• Rutherford's nuclear model addressed the limitations of previous atomic models
• Why did Bohr's model propose quantized energy levels for electrons?

  Prevent atomic collapse
• Development of atomic theory models in chronological order

  1️⃣ Dalton's atomic model

  2️⃣ Thomson's plum pudding model

  3️⃣ Rutherford's nuclear model

  4️⃣ Bohr's model
• Dalton's atomic model could explain the discovery of subatomic particles

  False
• Rutherford's nuclear model proposed that atoms have a small, dense, positively charged nucleus
• What did Thomson's plum pudding model propose about the positive charge of atoms?

  Positive charge is diffuse
• What was the main improvement of Thomson's plum pudding model over Dalton's atomic model?

  Recognized subatomic particles
• The Thomson's plum pudding model improved upon Dalton's atomic model by recognizing that atoms contain smaller subatomic particles
• Rutherford's nuclear model proposed that electrons orbit a small, dense, positively charged nucleus

  True
• Match the atomic model with its key feature:

  Dalton's model ↔️ Atoms are indivisible

  Thomson's model ↔️ Positively charged pudding with electrons

  Rutherford's model ↔️ Dense nucleus with orbiting electrons
• Rutherford's nuclear model proposed that atoms have a small, dense, positively charged nucleus
• Rutherford's model correctly portrayed the atom as having a concentrated positive charge in the nucleus.


  True