Question

| Atomic symbol | Atomic Number | Protons | Neutrons | Electrons | Atomic mass |
|---------------|---------------|---------|----------|-----------|-------------|
| __ | 29 | __ | 35 | __ | __ |

Answer 1

To fill in the missing values for the element with atomic number 29, which is Copper (Cu), we can use the following information:

- **Atomic Number**: 29 (already given)
- **Protons**: The atomic number also indicates the number of protons, which is also 29.
- **Neutrons**: The number of neutrons can be calculated using the formula:
\[
\text{Neutrons} = \text{Atomic Mass} - \text{Protons}
\]
Given that it is typical to use the most common isotope of copper for calculations, the atomic mass of Copper is approximately 63.55. Therefore, for the isotope with 35 neutrons:
\[
29 + 35 = 64 \quad (\text{atomic mass})
\]
- **Electrons**: In a neutral atom, the number of electrons is equal to the number of protons, which is 29.
- **Atomic Mass**: For the isotope with 35 neutrons, the atomic mass is approximately 64.

Here's the completed information:

| Atomic symbol | Atomic Number | Protons | Neutrons | Electrons | Atomic mass |
|---------------|---------------|---------|----------|-----------|-------------|
| Cu | 29 | 29 | 35 | 29 | 64 |