Question

Write the condensed electron configuration, partial orbital diagram showing valence electrons, full electron configuration, and the inner electrons of element Sr.

Answer 1

Strontium (Sr) has an atomic number of 38. Here's a detailed breakdown of its electron configuration:

### Full Electron Configuration:
To write the full electron configuration, we fill the orbitals in order of increasing energy:

1. 1s²
2. 2s²
3. 2p⁶
4. 3s²
5. 3p⁶
6. 4s²
7. 3d¹⁰
8. 4p⁶
9. 5s²

So, the full electron configuration for Strontium is:
\[
\text{Sr}: 1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 4s^2 \, 3d^{10} \, 4p^6 \, 5s^2
\]

### Condensed Electron Configuration:
The condensed electron configuration uses the nearest noble gas to simplify the notation. The nearest noble gas before Strontium is Krypton (Kr), which has an atomic number of 36.

So, the condensed configuration is:
\[
\text{Sr}: [\text{Kr}] \, 5s^2
\]

### Partial Orbital Diagram Showing Valence Electrons:
The valence electrons of Strontium are the electrons in the outermost shell, which are the 5s² electrons.

```plaintext
5s: ↑↓
```

### Inner Electrons:
The inner electrons are all those that are not part of the valence shell. For Strontium, these include all the electrons in the 1s, 2s, 2p, 3s, 3p, 4s, 3d, and 4p orbitals.

The inner electrons can be noted from the full configuration as:
\[
1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 4s^2 \, 3d^{10} \, 4p^6
\]

### Summary:
- **Full Electron Configuration**: \( 1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 4s^2 \, 3d^{10} \, 4p^6 \, 5s^2 \)
- **Condensed Electron Configuration**: \( [\text{Kr}] \, 5s^2 \)
- **Partial Orbital Diagram (Valence Electrons)**:
```
5s: ↑↓
```
- **Inner Electrons**: \( 1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 4s^2 \, 3d^{10} \, 4p^6 \)