Electron Configuration of Iron

Electron Configuration of Iron is a topic that can be confusing to many people. The fact is, even seasoned chemistry enthusiasts may have trouble understanding how electron configuration works. In this article I aim to break down what you need to know about the theory of electron configuration and explain it with simple terms.

Electron Configuration Of Iron

Electron Configuration of Iron

The electron configuration of iron is 1s2 2s2 2p6 3s2 3p6 4s2 3d6. The outermost electrons are in the 3d orbital, and there are two electrons in each of the 4s and 3d orbitals. The rest of the electrons are in the innermost orbitals. The 1st two electrons fill the 1s orbital, the next 2 electron fill the 2s orbital, and the next 6 electron fill the 2p orbitals. The last 4 electrons go into the 3d orbitals.

Innermost Shell

The innermost shell of an atom is the closest shell to the nucleus. The electrons in this shell have the lowest energy levels of all the electrons in the atom. The electrons in the innermost shell are also called valence electrons.

Outermost Shell

The outermost shell of an atom is important in determining the chemical properties of that element. The electrons in the outermost shell are known as valence electrons, and they are responsible for the chemical bonds between atoms. The number of valence electrons determines how many other atoms an atom can bond with. Atoms with fewer valence electrons tend to be more reactive, because they are looking to fill their outermost shell with electrons.

Important Facts of Iron

  • Iron is a chemical element of symbol ‘Fe’ (from Latin: ferrum) and it’s atomic number is 26.
  • It is a metal in the first transition series of periodic table.
  • It is through mass the most common element (IRON) on Earth, forming excess of Earth’s outer core and inner core.
  • This is the 4th common element in the Earth’s crust.
  • Pure iron is soft, but is unobtainable by smelting because it oxidizes easily.
  • Freshly cut iron has a silvery-gray appearance, but it rusts quickly when exposed to air and moisture.


Electron configuration of Iron


In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. For example, the electron configuration of the oxygen atom is 1s2 2s2 2p4. This means that the oxygen atom has six electrons, which are distributed in the orbitals as follows: two in the 1s orbital, two in the 2s orbital, and four in the 2p orbital. The electron configuration of an atom or molecule can be determined experimentally by means of spectroscopy. Alternatively, it can be calculated using theoretical models such as Hartree–Fock theory and density functional theory. The results of both methods agree with each other for most atoms and molecules. The following is the electron configuration of iron: 1s2 2s2 2p6 3s2 3p6 4s2 3d6

The electron configuration of iron

The electron configuration of iron is 1s2 2s2 2p6 3s2 3p6 4s2 3d6. The outermost energy level of an atom is called the valence shell, and the electrons in this shell are responsible for the chemical properties of an element. The valence electrons of iron are in the 4th energy level, so the valence shell is 4s2 3d6.

How to Determine the Electron Configuration of an Element

To determine the electron configuration of iron, you’ll need to know the atomic number of iron and the order of the periodic table. The atomic number of iron is 26, so you’ll need to look for iron in the fourth row of the periodic table. In the fourth row, you’ll find iron in the middle, with an atomic number of 26. The electron configuration of iron is 1s2 2s2 2p6 3s2 3p6 4s2 3d6.

The stability of iron

Iron is a transition metal with an atomic number of 26. It has 26 electrons in its outermost shell, and its electron configuration is [Ar] 3d6 4s2. Iron is a relatively stable element, and it does not readily react with other elements. However, when it does react, it forms compounds that are very important in the world around us.

The reactivity of iron

Iron is a relatively reactive metal and will oxidize in the presence of air. The oxide layer that forms on the surface of iron can protect it from further oxidation. However, if the oxide layer is breached, the iron will continue to oxidize.

The Importance of Electron Configuration

Electron configuration is important because it determines the way that electrons are arranged within an atom. This arrangement affects the way that the atom behaves, including its reactivity and chemical properties. For example, atoms with similar electron configurations tend to have similar chemical properties. Therefore, understanding electron configuration is essential for understanding atomic behavior and predicting chemical reactions.


In conclusion, the electron configuration of iron is [Ar] 3d64s2. This is a relatively stable configuration which gives iron its unique properties as an element and explains why it behaves differently than other elements on the periodic table. Understanding how electrons are arranged can provide insight into how materials interact with each other, allowing us to better understand their behavior in different environments.

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