Structure of an Atom: Thomson's Model of an Atom

The video explores the nature of charged particles and the evolution of atomic models. It begins with Dalton's model, which considered atoms indivisible. Goldstein's discovery of canal rays and Thomson's identification of electrons challenged this view, leading to the concept of subatomic particles. Thomson's model likened the atom to a pudding cake, with electrons embedded in a positive sphere. Rutherford's gold foil experiment further refined the atomic model, introducing the nucleus containing protons and neutrons, with electrons orbiting outside.

What was John Dalton's belief about the nature of atoms?

• Atoms are indivisible and indestructible.

• Atoms are divisible and destructible.

• Atoms are made of smaller particles.

• Atoms are only negatively charged.

Who discovered the existence of negatively charged particles?

• Goldstein

• Rutherford

• John Dalton

• JJ Thomson

What analogy is used to describe JJ Thomson's atomic model?

• A solar system

• A spherical pudding cake

• A cloud of gas

• A solid sphere

What did Rutherford's scattering experiment reveal about the atom?

• Atoms are only positively charged.

• Electrons are at the center of the atom.

• Protons and neutrons are in the nucleus.

• Atoms are indivisible.

Which subatomic particle is neutral and found in the nucleus?

• Neutron

• Electron

• Proton

• Photon