# Radon Valence Electrons (And How to Find them?)

So you have seen the above image by now, right?

Awesome! You can see that radon has 8 valence electrons.

But how can you say that Radon has 8 valence electrons
+
How can you find these valence electrons?

Let’s discuss this in short.

Radon has 8 valence electrons because there are 8 electrons present in the outermost shell of the Radon (Rn) atom.

Now let’s see how you can easily find the valence electrons of a Radon atom (Rn).

If you don’t want to read the texts, then you can also watch this video.

## How to find the Valence Electrons? (2 Methods)

In order to find the valence electrons of a Radon atom (Rn), you can use two methods.

### Method 1: From the Periodic Table

To find out the valence electrons of Radon, you have to see the position of radon in the periodic table.

More specifically, you have to see the group wise position of Radon element in the periodic table.

From the above image, you can see that the Radon (Rn) is present in the group 18 of periodic table.
(Note: Group 18 is also called group 8A).

So, as the radon element is present in group 18, it has 8 valence electrons.

In this way, by knowing the position of radon element in periodic table, you can easily find its valence electrons.

Now let’s see another method for finding the number of valence electrons in radon.

### Method 2: From the Electron Configuration

If you want to find the valence electrons of radon from its electron configuration, then you should know its electron configuration first.

Now there are many methods to write the electron configurations, but here I will show you the easiest method, i.e by using Aufbau principle.

Aufbau principle: The Aufbau principle simply states that the orbitals with the lower energy are filled first and then the orbitals with higher energy levels are filled.

According to the Aufbau principle, the orbitals are filled in the following order:
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, and so on.

Also the maximum number of electrons that can be accommodated in s, p, d & f orbitals are mentioned in the below table.

Now let’s try to find the electron configuration of Radon by using the Aufbau principle.

Follow the steps mentioned below to get the electron configuration of radon.

• To write the electron configuration of radon, we should first know the total number of electrons present in a radon atom.
• The radon atom has a total of 86 electrons because its atomic number is 86 and it is a neutral atom[2]
• Now we have to fill these 86 electrons in the atomic orbitals according to the Aufbau principle.
• According to the Aufbau principle, the electrons will be filled first in 1s orbital, then in 2s orbital, then in 2p orbital, and so on…
• So from the Aufbau principle, we can get the electron configuration of the radon atom as 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6. [3]

Now in this electron configuration of radon, we have to see the total number of electrons present in the highest energy level.

You can see in the electron configuration of radon (1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6) that the highest energy level is 6. And the total number of electrons present in this energy level is 2 + 6 = 8.

So by knowing the electron configuration, we have found that the Radon has 8 valence electrons.

I hope you have understood the methods of finding the valence electrons in radon.

See more related topics for your practice;
Hydrogen Valence Electrons
Helium Valence Electrons
Lithium Valence Electrons
Beryllium Valence Electrons
Sodium Valence Electrons

Author
##### Jay Rana

Jay is an educator and has helped more than 100,000 students in their studies by providing simple and easy explanations on different science-related topics. With a desire to make learning accessible for everyone, he founded Knords Learning, an online learning platform that provides students with easily understandable explanations.