We’re being asked to determine the correct noble gas electron configuration for Fe3+, Fe2+, and Zn2+.
Before we can do that, we have to first write the electron configuration of a neutral ground state iron (Fe).
You can determine the ground-state electron configuration of Iron (Fe) by locating its position in the periodic table.
You see from the periodic table that FeCr is in Period 4 and d-block
• Before reaching Fe, you will pass through the atomic orbitals 1s, 2s, 2p, 3s, 3p, 4s, 3d
• In a neutral atom:
Atomic number = # of protons = # of electrons
Fe atomic number = 26 → 26 protons & 26 electrons
• Distribute electrons in the atomic orbitals:
Consider Fe3+, Fe2+, and Zn2+:
a. Write the electron configuration for each ion
b. Unlike iron, zinc is unlikely to have additional oxidation states, such as Zn+ or Zn3+. Briefly explain why zinc nearly always forms Zn2+ ions.
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