The image provided is a worksheet that outlines the contributions of various scientists to our understanding of atomic structure. The task appears to be matching the scientists with their respective models or discoveries about atoms. Below is an explanation of the solution:
Key Points from the Image:
1.
Democritus:
- Contribution: Said that matter is made up of tiny particles he called "atoms," which means they cannot be divided.
- Model: A simple solid sphere (as shown in the image).
2.
John Dalton:
- Contribution: Discovered that atoms are tiny solid spheres and that atoms of different elements are of different sizes.
- Model: Three different-colored spheres representing different types of atoms.
3.
J.J. Thomson:
- Contribution: Discovered the electron and proposed that it had a negative charge, leading to the idea that atoms have both positive and negative charges.
- Model: A model showing electrons embedded within a positively charged sphere (the "plum pudding" model).
4.
Ernest Rutherford:
- Contribution: Discovered the nucleus and that it had a positive charge. He also proposed that most of the atom's mass is concentrated in the nucleus.
- Model: A model showing a dense, positively charged nucleus surrounded by orbiting electrons.
5.
Niels Bohr:
- Contribution: Proposed that electrons move around the nucleus in specific orbits (quantized energy levels).
- Model: A model showing electrons in circular orbits around a central nucleus.
Solution Explanation:
The task requires linking each scientist to their corresponding contribution and model. Here’s how the information aligns:
1.
Democritus:
- Contribution: Matter is made up of indivisible particles called atoms.
- Model: Simple solid sphere (last image on the right).
2.
John Dalton:
- Contribution: Atoms are tiny solid spheres of different sizes for different elements.
- Model: Three different-colored spheres (top image on the right).
3.
J.J. Thomson:
- Contribution: Discovered the electron and proposed the "plum pudding" model.
- Model: Electrons embedded in a positively charged sphere (second image from the bottom on the right).
4.
Ernest Rutherford:
- Contribution: Discovered the nucleus and its positive charge.
- Model: Dense nucleus with electrons orbiting (third image from the bottom on the right).
5.
Niels Bohr:
- Contribution: Proposed quantized orbits for electrons around the nucleus.
- Model: Electrons in specific orbits (fourth image from the bottom on the right).
Final Answer:
-
Democritus: Simple solid sphere (last image).
-
John Dalton: Three different-colored spheres (top image).
-
J.J. Thomson: Plum pudding model (second image from the bottom).
-
Ernest Rutherford: Dense nucleus with orbiting electrons (third image from the bottom).
-
Niels Bohr: Electrons in specific orbits (fourth image from the bottom).
This matches the historical progression of atomic theory, starting from Democritus' early concept of indivisible atoms to Bohr's more sophisticated model of quantized electron orbits.
Final Answer Boxed:
\[
\boxed{
\begin{array}{ll}
\text{Democritus} & \text{Simple solid sphere} \\
\text{John Dalton} & \text{Three different-colored spheres} \\
\text{J.J. Thomson} & \text{Plum pudding model} \\
\text{Ernest Rutherford} & \text{Dense nucleus with orbiting electrons} \\
\text{Niels Bohr} & \text{Electrons in specific orbits} \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of atomic model worksheet.
