Atomic structure worksheet | PDF - Free Printable

The image provided is already the Solution Key for an Atomic Structure Worksheet. This means it contains the correct answers for filling in the chart regarding protons, neutrons, electrons, atomic mass, and atomic number for various elements.

Since the request is to "solve the problem accurately" but the image *is* the solution, I will verify the data presented in the key to ensure its accuracy based on standard periodic table values (rounded to the nearest whole number as instructed). Then, I will present the verified correct data as the final answer.

Step-by-Step Verification:

We need to check each row for consistency using these rules:
1. Atomic Number = Number of Protons = Number of Electrons (in a neutral atom).
2. Atomic Mass ≈ Number of Protons + Number of Neutrons.
3. The instructions say to round atomic masses to the nearest whole number.

Let's check each element:

1. Lithium:
* Protons: 3, Electrons: 3, Atomic Number: 3. (Consistent)
* Neutrons: 4. Mass = 3 + 4 = 7. Listed Mass: 7. (Correct)

2. Carbon:
* Protons: 6, Electrons: 6, Atomic Number: 6. (Consistent)
* Neutrons: 6. Mass = 6 + 6 = 12. Listed Mass: 12. (Correct)

3. Chlorine:
* Protons: 17, Electrons: 17, Atomic Number: 17. (Consistent)
* Neutrons: 18. Mass = 17 + 18 = 35. Listed Mass: 35. (Correct)

4. Silver:
* Protons: 47, Electrons: 47, Atomic Number: 47. (Consistent)
* Neutrons: 61. Mass = 47 + 61 = 108. Listed Mass: 108. (Correct)

5. Lead:
* Protons: 82, Electrons: 82, Atomic Number: 82. (Consistent)
* Neutrons: 125. Mass = 82 + 125 = 207. Listed Mass: 207. (Correct)

6. Calcium:
* Protons: 20, Electrons: 20, Atomic Number: 20. (Consistent)
* Neutrons: 20. Mass = 20 + 20 = 40. Listed Mass: 40. (Correct)

7. Tantalum:
* Protons: 73, Electrons: 73, Atomic Number: 73. (Consistent)
* Neutrons: 108. Mass = 73 + 108 = 181. Listed Mass: 181. (Correct)

8. Radium:
* Protons: 88, Electrons: 88, Atomic Number: 88. (Consistent)
* Neutrons: 138. Mass = 88 + 138 = 226. Listed Mass: 226. (Correct)

9. Samarium:
* Protons: 62, Electrons: 62, Atomic Number: 62. (Consistent)
* Neutrons: 88. Mass = 62 + 88 = 150. Listed Mass: 150. (Correct)

10. Uranium:
* Protons: 92, Electrons: 92, Atomic Number: 92. (Consistent)
* Neutrons: 146. Mass = 92 + 146 = 238. Listed Mass: 238. (Correct)

11. Americium:
* Protons: 95, Electrons: 95, Atomic Number: 95. (Consistent)
* Neutrons: 148. Mass = 95 + 148 = 243. Listed Mass: 243. (Correct)

12. Lawrencium:
* Protons: 103, Electrons: 103, Atomic Number: 103. (Consistent)
* Neutrons: 159. Mass = 103 + 159 = 262. Listed Mass: 262. (Correct)

All values in the provided solution key are mathematically consistent and accurate according to standard atomic data rounded to the nearest whole number.

Final Answer:
The chart in the image is correctly filled out. Here is the verified data for each element:

| Element | Number of Protons | Number of Neutrons | Number of Electrons | Atomic Mass | Atomic Number |
| :--- | :---: | :---: | :---: | :---: | :---: |
| lithium | 3 | 4 | 3 | 7 | 3 |
| carbon | 6 | 6 | 6 | 12 | 6 |
| chlorine | 17 | 18 | 17 | 35 | 17 |
| silver | 47 | 61 | 47 | 108 | 47 |
| lead | 82 | 125 | 82 | 207 | 82 |
| calcium | 20 | 20 | 20 | 40 | 20 |
| tantalum | 73 | 108 | 73 | 181 | 73 |
| radium | 88 | 138 | 88 | 226 | 88 |
| samarium | 62 | 88 | 62 | 150 | 62 |
| uranium | 92 | 146 | 92 | 238 | 92 |
| americium | 95 | 148 | 95 | 243 | 95 |
| lawrencium | 103 | 159 | 103 | 262 | 103 |