Question

1. which list shows the development of atomic models in chronological order?

plum pudding, solid ball, solar system
solid ball, electron cloud, solar system
plum pudding, solar system, electron cloud

Explanation:

• Solid - ball model: Proposed by John Dalton in the early 19th century. He considered atoms as indivisible solid spheres.
• Plum - pudding model: J.J. Thomson proposed this model in 1904. He suggested that electrons (negative charges) are embedded in a positively - charged “soup” or “pudding”.
• Solar - system (Rutherford) model: Ernest Rutherford proposed this in 1911. He discovered the nucleus, and the model was similar to a solar system with electrons orbiting the nucleus.
• Electron - cloud model: Developed in the 1920s (quantum mechanical model). It describes the probability of finding an electron in a certain region around the nucleus.

Answer:

plum pudding, solar system, electron cloud