GCSE Chemistry - History of the Model of the Atom #7

The video explores the evolution of atomic theory, starting with Democritus' idea of indivisible particles. John Dalton later described atoms as solid spheres, followed by JJ Thompson's plum pudding model introducing electrons. Rutherford's gold foil experiment led to the nuclear model, identifying a dense nucleus. Niels Bohr refined this with his planetary model, explaining electron orbits. Further discoveries identified protons and neutrons, forming the modern atomic model.

Who first proposed the idea that matter is made up of indivisible particles?

• Ernst Rutherford

• JJ Thompson

• Democritus

• John Dalton

What was the key feature of JJ Thompson's plum pudding model?

• Atoms are solid spheres

• Atoms have orbiting electrons

• Atoms have a nucleus

• Atoms contain electrons within a positive charge

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

• Atoms are solid spheres

• Atoms have a dense nucleus

• Atoms have electrons in shells

• Atoms are made of indivisible particles

How did Niels Bohr's model address the issue of atomic collapse?

• By identifying protons and neutrons

• By introducing the concept of a nucleus

• By suggesting atoms are solid spheres

• By proposing electrons orbit in shells

Who provided evidence for the existence of neutrons in the nucleus?

• John Dalton

• JJ Thompson

• Niels Bohr

• James Chadwick