Atomic theory

The video explores the evolution of atomic theory, starting with the ancient Greek concept of indivisible atoms. It progresses through John Dalton's postulates, Thompson's discovery of electrons and the plum pudding model, Rutherford's gold foil experiment leading to the nuclear model, and Bohr's refinement with electron orbits. The video concludes with a summary of the current understanding of atomic structure.

What was the main idea behind the ancient Greek theory of atoms?

• Atoms are made of smaller particles.

• Atoms are identical for all elements.

• Atoms are indivisible units of matter.

• Atoms can be transformed into energy.

Which of the following was NOT one of John Dalton's conclusions about atoms?

• Chemical reactions rearrange atoms.

• Atoms can be subdivided into smaller particles.

• Atoms make up all matter.

• Atoms of the same element are identical.

What did J.J. Thompson's plum pudding model suggest about the structure of an atom?

• Atoms are made of protons and neutrons.

• Atoms have a central nucleus.

• Atoms have electrons orbiting the nucleus.

• Atoms are a positively charged sphere with electrons inside.

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

• Electrons are embedded in a positive sphere.

• Atoms have a dense, positively charged nucleus.

• Atoms are indivisible.

• Atoms are mostly empty space.

According to Bohr's model, how do electrons move around the nucleus?

• Electrons orbit the nucleus in specific shells.

• Electrons move randomly around the nucleus.

• Electrons are stationary around the nucleus.

• Electrons are embedded within the nucleus.