Atomic Model

Who proposed the "plum pudding" model of the atom?

• Niels Bohr
• Ernest Rutherford
• J.J. Thomson
• John Dalton

Which experiment led to the discovery of the atomic nucleus?

• Oil drop experiment
• Gold foil experiment
• Cathode ray tube experiment
• Hydrogen line spectrum experiment

What was John Dalton’s main contribution to atomic theory?

• Discovery of electrons
• Concept of quantized energy levels
• Discovery of the neutron
• Idea of atoms as indivisible particles in elements

Which scientist’s work established the concept of quantized electron orbits

• Ernest Rutherford
• James Chadwick
• Neils Bohr
• R.A. Millikan

Who discovered the neutron?

• J.J. Thomson
• James Chadwick
• Ernest Rutherford
• John Dalton

The oil drop experiment, which measured the charge of the electron, was conducted by which scientist?

• R.A. Millikan
• Ernest Rutherford
• Niels Bohr
• James Chadwick

Which atomic model first introduced the idea of a dense, positively charged nucleus?

• Dalton’s model
• Bohr’s model
• Rutherford’s model
• J.J. Thomson’s model

According to Bohr’s model, electrons can only occupy specific energy levels because of which concept?

• Quantum energy states
• Electromagnetic repulsion
• Continuous spectrum
• Cathode ray interactions

Which of the following scientists proposed that atoms of different elements combine in whole-number ratios to form compounds?

• J.J. Thomson
• Niels Bohr
• John Dalton
• R.A. Millikan

What was the limitation of Rutherford's atomic model?

• It failed to explain the presence of neutrons
• It couldn't describe electron energy levels accurately
• It didn’t account for protons
• It included electrons embedded in a positive sphere