In a periodic table, there are 118 identified elements. In this article, we are discussing about one such element.

**Radon(Rn) is a nobel gas element present in group eighteen of the table, having very low reactivity and mass number of 222. Rn is radioactive and decays to series of unstable isotopes. In 1899, it was discovered by Rutherford and Owens during radioactive experiments. Oxidation state of +2 is known in Rn**.

Let us cover the interesting facts about electron density and distribution of electrons in Radon.

**How to write Radon Electron Configuration?**

**The atomic number of Radon is 86. The electronic structure is defined by certain rules. These are as follows:**

#### Step 1: Find the energy order of the orbitals

**Electrons should be filled in the atomic orbitals in increasing order of energies, where the ****Aufbau principle**** observes the (n+l) rule, n= Prinicipal quantum number and l= Azimuthal quantum number.** **For Radon, the energy order is:** **1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s < 4f < 5d < 6p**

#### Step 2: Electrons are filled in each orbitals

**For each orbital, only 2 electrons can reside with varied spins, as per ****Pauli’s exclusion principle****.** **As such, s-orbital holds 2 electrons, p orbitals hold net 6 electrons and f-orbitals hold 14 electrons. Electrons should be written in superscripts in the orbital ordering notation as per conventions.**

#### Step 3: Electrons are arranged in all the orbitals

**Every orbital of the sub-shell or energy level must be filled before pairing electrons, as per ****Hund’s rule****.The resultant electronic configuration is:1s ^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{2} 4d^{10} 5p^{6} 6s^{2} 4f^{14} 5d^{10} 6p^{6}**

**Radon Electron Configuration Diagram**

**Rn has the following orbital features:**

**Total orbitals of all sub-levels- 44****Total energy levels- 15**

Sub-shell | Number of Orbitals |
---|---|

s | 1 |

p | 3 |

d | 5 |

f | 7 |

**Table of Orbitals**

**Radon Electron Configuration Notation**

**Rn _{86} Electronic Configuration- [Xe_{54}] 4f^{14} 5d^{10} 6p^{6}**.

**Since Rn itself is a Nobel element, the smaller electron configuration notation is defined with respect to the previous Nobel gas element of the table.**

**Radon Unabbreviated Electron Configuration**

**All the orbitals and respective sub-shells are shown below in the unabbreviated form:**

**1s ^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{2} 4d^{10} 5p^{6} 6s^{2} 4f^{14} 5d^{10} 6p^{6}**

**Ground State Radon Electron Configuration**

**Electron configuration of ground state of Radon remains undisturbed and stands as:****1s ^{2} 2s^{2} 2p_{x}^{2} 2p_{y}^{2} 2p_{z}^{2} 3s^{2} 3p_{x}^{2 }3p_{y}^{2} 3p_{z}^{2} 4s^{2} 3d_{xy}^{2} 3d_{yz}^{2} 3d_{xz}^{2} 3d^{2}_{x2-y2} 3d_{z2}^{2} 4p_{x}^{2} 4p_{y}^{2} 4p_{z}^{2} 5s^{2} 4d_{xy}^{2} 4d_{yz}^{2} 4d_{xz}^{1} 4d^{1}_{x2-y2} 4d_{z2}^{1} 5p_{x}^{2} 5p_{y}^{2} 5p_{z}^{2} 6s^{2} 4f^{2}_{xz}^{2} 4f^{2}_{yz}^{2} 4f^{2}_{xyz} 4f^{2}_{z(x}^{2}_{-y}^{2}_{) }4f^{2}_{z}^{3} 4f^{2}_{y(3x}^{2}_{–y}^{2}_{) }4f^{2}_{x(x}^{2}_{–3y}^{2}_{)} 5d_{xy}^{2} 5d_{yz}^{2} 5d_{xz}^{2} 5d^{2}_{x2-y2} 5d_{z2}^{2} 6p_{x}^{2} 6p_{y}^{2} 6p_{z}^{2}**

**1s orbital with least energy is filled first, followed by 2s and p orbital series till 3p orbitals.****Though 3d has lower n=3, 4s gets filled before 3d as it has lower energy by (n+l) formula.****This concept is also applied in 5s-4f ordering where 5s is filled****before 4d.****The five orbitals of d are mentioned as per the orbital axes and same goes for the complex f-orbitals.****The principal quantum number n increases as we go up the energy series and finally the electron configuration ends at 6p orbital.**

**Excited State of Radon Electron Configuration**

**One combination: 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{2} 4d^{10} 5p^{6} 6s^{2} 4f^{14} 5d^{10} 6p_{x}^{1} 6p_{y}^{2} 6p_{z}^{2} 7s^{1}** .

**On exciting the atom, the electron jumps from a lower energy orbital to a higher energy orbital. Other Possible configurations are as follows:**

**1s**^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}4f^{14}5d^{10}6p_{x}^{2}6p_{y}^{1}6p_{z}^{2}7s^{1}**1s**^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}4f^{14}5d^{10}6p_{x}^{2}6p_{y}^{2}6p_{z}^{1}7s^{1}

**Ground State of Radon Orbital Diagram**

**In the ground state of Rn, the electrons are arranged following the classical rules of filling according to the increasing order of energies.**

**Radon Condensed Electron Configuration**

**Radon condensed electron configuration is 1s ^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{2} 4d^{10} 5p^{6} 6s^{2} 4f^{14} 5d^{10} 6p^{6}. It is the same as the ground state configuration, with the electrons following all the rules.**

**Conclusion**

Radon,a nobel element, decays to very short-lived products. Though it was earlier used in radiation process, the monoatomic element has extreme radioactive hazards. Thus, the electronic structure explains what a nobel gas configuration looks like.

**Also Read:**

- Americium electron configuration
- Germanium electron configuration
- Seaborgium electron configuration
- Mercury electron configuration
- Lithium electron configuration
- Strontium electron configuration
- Neptunium electron configuration
- Meitnerium electron configuration
- Hassium electron configuration
- Ytterbium electron configuration

Hello….Neeloy here! I have pursued a Master’ in Chemistry and am currently a Subject Matter Expert in this community. Science and reasoning feed my curiosity and I love to express whatever I see, in my words. Quiz addict. Let’s connect at LinkedIn.