How do you determine the electron configuration of Fe?

To determine the electron configuration of iron (Fe), which has an atomic number of 26, you need to follow a systematic approach based on the principles of electron filling in atomic orbitals.

Understanding Electron Configuration

Electron configuration describes how electrons are distributed in an atom's orbitals. For iron, we fill the orbitals according to the Aufbau principle, Hund's rule, and the Pauli exclusion principle.

Steps to Determine the Configuration

• Identify the Atomic Number: Iron has 26 electrons since its atomic number is 26.
• Fill the Orbitals: Start filling from the lowest energy level to the highest:
• 1s²
• 2s²
• 2p⁶
• 3s²
• 3p⁶
• 4s²
• 3d⁶

Final Configuration

After filling all the orbitals, the electron configuration for iron is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶

Summary

This configuration shows that iron has two electrons in the 4s orbital and six electrons in the 3d orbital, which is typical for transition metals. Understanding this arrangement helps in predicting the chemical behavior of iron.