Science worksheet designed to help students practice identifying atomic numbers and calculating subatomic particles for different chemical elements.

To complete the chart, we need to determine the Atomic Number, Atomic Mass, Protons, Neutrons, and Electrons for each element. Here’s how we can do it step by step:

1. Atomic Number: This is the number of protons in the nucleus of an atom. It is also the number of electrons in a neutral atom.
2. Atomic Mass: This is the sum of the number of protons and neutrons in the nucleus.
3. Protons: This is the same as the Atomic Number.
4. Neutrons: This is calculated by subtracting the Atomic Number from the Atomic Mass.
5. Electrons: In a neutral atom, this is the same as the number of protons (Atomic Number).

Let's fill in the chart for each element:

- Sn (Tin)
- Atomic Number: 50
- Atomic Mass: 118.71
- Protons: 50
- Neutrons: 118.71 - 50 = 68.71 (round to 69)
- Electrons: 50

- Xe (Xenon)
- Atomic Number: 54
- Atomic Mass: 131.29
- Protons: 54
- Neutrons: 131.29 - 54 = 77.29 (round to 77)
- Electrons: 54

- Zr (Zirconium)
- Atomic Number: 40
- Atomic Mass: 91.22
- Protons: 40
- Neutrons: 91.22 - 40 = 51.22 (round to 51)
- Electrons: 40

- C (Carbon)
- Atomic Number: 6
- Atomic Mass: 12.01
- Protons: 6
- Neutrons: 12.01 - 6 = 6.01 (round to 6)
- Electrons: 6

- S (Sulfur)
- Atomic Number: 16
- Atomic Mass: 32.07
- Protons: 16
- Neutrons: 32.07 - 16 = 16.07 (round to 16)
- Electrons: 16

- Ar (Argon)
- Atomic Number: 18
- Atomic Mass: 39.95
- Protons: 18
- Neutrons: 39.95 - 18 = 21.95 (round to 22)
- Electrons: 18

- Ag (Silver)
- Atomic Number: 47
- Atomic Mass: 107.87
- Protons: 47
- Neutrons: 107.87 - 47 = 60.87 (round to 61)
- Electrons: 47

- Li (Lithium)
- Atomic Number: 3
- Atomic Mass: 6.94
- Protons: 3
- Neutrons: 6.94 - 3 = 3.94 (round to 4)
- Electrons: 3

- U (Uranium)
- Atomic Number: 92
- Atomic Mass: 238.03
- Protons: 92
- Neutrons: 238.03 - 92 = 146.03 (round to 146)
- Electrons: 92

Final Answer:
| Symbol | Atomic Number | Atomic Mass | Protons | Neutrons | Electrons |
|--------|---------------|-------------|---------|----------|-----------|
| Sn | 50 | 118.71 | 50 | 69 | 50 |
| Xe | 54 | 131.29 | 54 | 77 | 54 |
| Zr | 40 | 91.22 | 40 | 51 | 40 |
| C | 6 | 12.01 | 6 | 6 | 6 |
| S | 16 | 32.07 | 16 | 16 | 16 |
| Ar | 18 | 39.95 | 18 | 22 | 18 |
| Ag | 47 | 107.87 | 47 | 61 | 47 |
| Li | 3 | 6.94 | 3 | 4 | 3 |
| U | 92 | 238.03 | 92 | 146 | 92 |