Fill in the blanks on the Subatomic Particles Practice Sheet to determine missing values like protons, neutrons, and atomic mass for different isotopes.

Let's solve this step by step. We need to fill in the missing values in the table using the relationships between atomic number, protons, neutrons, and atomic mass.

Key Concepts:

- Atomic Number (Z) = number of protons
- Number of Protons = Atomic Number
- Number of Neutrons = Atomic Mass – Atomic Number
- Atomic Mass (A) = Protons + Neutrons
- Atomic Symbol: Use periodic table to identify element based on atomic number

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We will go row by row and fill in the blanks.

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Row 1:

- Atomic Symbol: B (Boron)
- Atomic Number: ?
→ Boron has atomic number 5
- Protons: ? → Same as atomic number → 5
- Neutrons: 6
- Atomic Mass: ? → Protons + Neutrons = 5 + 6 = 11

✔ So:
Atomic Number = 5, Protons = 5, Atomic Mass = 11

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Row 2:

- Atomic Number: 12
- Protons: 12 (same as atomic number)
- Neutrons: ?
- Atomic Mass: 25
- Atomic Symbol: ? → Element with atomic number 12 is Mg (Magnesium)

→ Neutrons = Atomic Mass – Protons = 25 – 12 = 13

✔ So:
Atomic Symbol = Mg, Neutrons = 13

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Row 3:

- Atomic Number: 31
- Protons: 31
- Neutrons: 37
- Atomic Mass: ? → 31 + 37 = 68
- Atomic Symbol: ? → Atomic number 31 is Ga (Gallium)

✔ So:
Atomic Symbol = Ga, Atomic Mass = 68

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Row 4:

- Atomic Number: ?
- Protons: 43
- Neutrons: ?
- Atomic Mass: 100
- Atomic Symbol: ?

→ Protons = 43 → Atomic Number = 43 → Element is Tc (Technetium)

→ Neutrons = 100 – 43 = 57

✔ So:
Atomic Number = 43, Neutrons = 57, Atomic Symbol = Tc

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Row 5:

- Atomic Symbol: Pb (Lead)
- Atomic Number: ? → Pb has atomic number 82
- Protons: 82
- Neutrons: ?
- Atomic Mass: 209

→ Neutrons = 209 – 82 = 127

✔ So:
Atomic Number = 82, Protons = 82, Neutrons = 127

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Row 6:

- Atomic Number: ?
- Protons: ?
- Neutrons: 101
- Atomic Mass: 171
- Atomic Symbol: ?

→ Protons = Atomic Mass – Neutrons = 171 – 101 = 70

→ Atomic Number = 70 → Element is Yb (Ytterbium)

✔ So:
Atomic Number = 70, Protons = 70, Atomic Symbol = Yb

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Row 7:

- Atomic Number: ?
- Protons: ?
- Neutrons: 45
- Atomic Mass: 80
- Atomic Symbol: ?

→ Protons = 80 – 45 = 35

→ Atomic Number = 35 → Element is Br (Bromine)

✔ So:
Atomic Number = 35, Protons = 35, Atomic Symbol = Br

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Row 8:

- Atomic Number: 29
- Protons: 29
- Neutrons: 35
- Atomic Mass: ? → 29 + 35 = 64
- Atomic Symbol: ? → Atomic number 29 is Cu (Copper)

✔ So:
Atomic Mass = 64, Atomic Symbol = Cu

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Row 9:

- Atomic Number: ?
- Protons: 89
- Neutrons: ?
- Atomic Mass: 225
- Atomic Symbol: ?

→ Atomic Number = 89 → Element is Ac (Actinium)

→ Neutrons = 225 – 89 = 136

✔ So:
Atomic Number = 89, Neutrons = 136, Atomic Symbol = Ac

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Row 10:

- Atomic Symbol: Yb (Ytterbium)
- Atomic Number: ? → Yb is 70
- Protons: 70
- Neutrons: ?
- Atomic Mass: 172

→ Neutrons = 172 – 70 = 102

✔ So:
Atomic Number = 70, Protons = 70, Neutrons = 102

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Row 11:

- Atomic Symbol: Mo (Molybdenum)
- Atomic Number: ? → Mo is 42
- Protons: 42
- Neutrons: 55
- Atomic Mass: ? → 42 + 55 = 97

✔ So:
Atomic Number = 42, Protons = 42, Atomic Mass = 97

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Row 12:

- Atomic Number: 81
- Protons: 81
- Neutrons: ?
- Atomic Mass: 206
- Atomic Symbol: ? → Atomic number 81 is Tl (Thallium)

→ Neutrons = 206 – 81 = 125

✔ So:
Atomic Symbol = Tl, Neutrons = 125

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Row 13:

- Atomic Number: 100
- Protons: 100
- Neutrons: 159
- Atomic Mass: ? → 100 + 159 = 259
- Atomic Symbol: ? → Atomic number 100 is Fm (Fermium)

✔ So:
Atomic Mass = 259, Atomic Symbol = Fm

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Row 14:

- Atomic Symbol: No (Nobelium)
- Atomic Number: ? → Nobelium is 102
- Protons: 102
- Neutrons: ?
- Atomic Mass: 261

→ Neutrons = 261 – 102 = 159

✔ So:
Atomic Number = 102, Protons = 102, Neutrons = 159

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Row 15:

- Atomic Number: 49
- Protons: 49
- Neutrons: 65
- Atomic Mass: ? → 49 + 65 = 114
- Atomic Symbol: ? → Atomic number 49 is In (Indium)

✔ So:
Atomic Mass = 114, Atomic Symbol = In

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Final Completed Table:

| Atomic Symbol | Atomic Number | Protons | Neutrons | Atomic Mass |
|---------------|---------------|---------|----------|-------------|
| B | 5 | 5 | 6 | 11 |
| Mg | 12 | 12 | 13 | 25 |
| Ga | 31 | 31 | 37 | 68 |
| Tc | 43 | 43 | 57 | 100 |
| Pb | 82 | 82 | 127 | 209 |
| Yb | 70 | 70 | 101 | 171 |
| Br | 35 | 35 | 45 | 80 |
| Cu | 29 | 29 | 35 | 64 |
| Ac | 89 | 89 | 136 | 225 |
| Yb | 70 | 70 | 102 | 172 |
| Mo | 42 | 42 | 55 | 97 |
| Tl | 81 | 81 | 125 | 206 |
| Fm | 100 | 100 | 159 | 259 |
| No | 102 | 102 | 159 | 261 |
| In | 49 | 49 | 65 | 114 |

> ✔ All rows are now complete!

Let me know if you'd like this formatted into a printable table!