Question

| Atomic symbol | Atomic Number | Protons | Neutrons | Electrons | Atomic mass |
|---------------|---------------|---------|----------|-----------|-------------|
| Pb | __ | __ | __ | __ | 207 |

Answers

GPT-4o mini
To fill in the missing information for lead (Pb):

1. **Atomic Symbol**: Pb
2. **Atomic Number**: 82 (This is the number of protons and also electrons in a neutral atom)
3. **Protons**: 82
4. **Neutrons**: The atomic mass of lead is approximately 207, and since the atomic mass is the sum of protons and neutrons, we can calculate the number of neutrons as follows:

Neutrons = Atomic mass - Protons = 207 - 82 = 125

5. **Electrons**: 82 (since it is neutral, the number of electrons equals the number of protons)
6. **Atomic Mass**: 207

Here’s the completed table:

| Atomic symbol | Atomic Number | Protons | Neutrons | Electrons | Atomic mass |
|---------------|---------------|---------|----------|-----------|-------------|
| Pb | 82 | 82 | 125 | 82 | 207 |