To determine the correct order of development for the atomic model, we need to understand the historical progression of atomic theories and models over time. Here's a step-by-step explanation:
1. Model X: Solid, Indivisible Sphere (Dalton's Model)
This was one of the earliest models of the atom. Proposed by John Dalton in the early 19th century, this model depicted the atom as a solid, indivisible sphere.
2. Model Y: Electrons Embedded in a Cloud of Positive Charge (Thomson's Plum Pudding Model)
J.J. Thomson proposed this model in 1904 after discovering the electron. In this model, the atom is composed of electrons scattered within a "cloud" of positive charge, similar to plums in a pudding.
3. Model Z: Electrons Move Around Center in a Negatively Charged Cloud (Rutherford's Model)
Ernest Rutherford proposed this model in 1911 after his gold-foil experiment. He suggested that the atom has a tiny, dense, positively charged nucleus with electrons orbiting around it, similar to planets around the sun.
4. Model W: Electrons Orbit the Center in Specific Regions Called Energy Levels (Bohr's Model)
Niels Bohr refined Rutherford's model in 1913 by introducing specific energy levels or orbits for the electrons, stating that they orbit the nucleus at certain fixed distances.
Given the above explanations and the progression of atomic models, we can outline the historical order as follows:
- X -> Y -> Z -> W
Thus, the correct order of development for the atomic model is:
"X -> Y -> Z -> W"
Therefore, the correct option is:
[tex]$X \rightarrow Y \rightarrow W \rightarrow Z$[/tex]
This matches the third option:
[tex]$X \rightarrow Y \rightarrow W \rightarrow Z$[/tex]
