The Evolution Of Atomic Models From Dalton To Bohr

The video explores the evolution of atomic theory, starting with John Dalton's proposal in 1803 that atoms are indivisible particles. It then discusses the discovery of subatomic particles, leading to J. J. Thompson's plum pudding model after identifying the electron. Ernest Rutherford's gold foil experiment revealed the nucleus, prompting a new atomic model. Niels Bohr later introduced the planetary model, explaining electron orbits and energy levels, which addressed the issue of atomic collapse. The video concludes by hinting at the quantum mechanical model, which will be covered in another video.

Who is credited with proposing the atomic theory in 1803?

• Ernest Rutherford

• Niels Bohr

• John Dalton

• J.J. Thompson

What did J.J. Thompson discover through his experiments with cathode rays?

• Electrons

• Nucleus

• Protons

• Neutrons

Which model of the atom did J.J. Thompson propose?

• Quantum Mechanical Model

• Planetary Model

• Plum Pudding Model

• Solid Sphere Model

What was the significant finding from Rutherford's gold foil experiment?

• Atoms are solid spheres

• Electrons orbit the nucleus

• Atoms have a dense nucleus

• Atoms are indivisible

What did Rutherford's experiment suggest about the structure of an atom?

• Atoms are made of waves

• Atoms are mostly empty space

• Atoms are solid throughout

• Atoms have no charge

What problem did Niels Bohr address with his atomic model?

• The indivisibility of atoms

• The collapse of the atom

• The charge of electrons

• The mass of the nucleus

In Bohr's model, how are electrons arranged around the nucleus?

• In a dense core

• Randomly scattered

• In fixed energy levels

• In a solid sphere

What term describes the energy change when an electron moves between energy levels in Bohr's model?

• Photon jump

• Electron transition

• Energy shift

• Quantum leap

What do valence electrons determine in an atom?

• The atomic mass

• The chemical properties

• The atomic number

• The nuclear charge

Which model succeeded the Bohr model of the atom?

• Quantum Mechanical Model

• Solid Sphere Model

• Plum Pudding Model

• Rutherford Model