# What is the Ionic Charge of Selenium (Se)? And Why?

The Ionic Charge of Selenium (Se) is 2-.

But the question is how can you find the ionic charge on Selenium (Se)?

Well there are 2 methods by which you can find the ionic charge of Selenium (Se).

Lets dive right into these methods one by one.

You can also refer to the below video from which you will learn to find charge of any ion.

## Method 1: By looking at the ionic charge trends on periodic table

This is a very simple method to determine the ionic charge of the monatomic ions.

First of all, let’s look at the group-wise ionic charge trends on the periodic table.

You can see in the above periodic table that;

• Elements of group 1 have 1+ ionic charge,
• Elements of group 2 have 2+ ionic charge,

(Exclude transition metals, because they have variable ionic charges)

• Elements of group 13 have 3+ ionic charge,

(Exclude group 14, because they can have 4+ or 4- ionic charges)

• Elements of group 15 have 3- ionic charge,
• Elements of group 16 have 2- ionic charge,
• Elements of group 17 have 1- ionic charge,
• Elements of group 18 have 0 ionic charge,

Now here our element is Selenium (Se) which lies in group 16 of the periodic table.

Hence the ionic charge of Selenium (Se) is 2-.

Note:
The blank area shown in the above periodic table are mostly the transition and post-transition elements.
They show variable ionic charge.
Hence we cannot find their ionic charge by simply looking at the periodic table.
In order to find the charge of these elements, we need to look at what it is bonded with.

Okay so now let’s see another method to find the ionic charge of Selenium (Se).

## Method 2: By using electron configuration

The electron configuration of Selenium is: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or [Ar] 3d10 4s2 4p4. [1]

You can see that the outermost orbit of Selenium has 6 electrons.

During the chemical reaction, selenium gains 2 more electrons and achieves the nearest noble gas configuration to become stable.

And as the Selenium (Se) gains 2 electrons, it forms Se2- ion.

Hence the ionic charge of Selenium (Se) is 2-.

I hope you have understood the reason behind the 2- charge of selenium.

Check out some other related topics for your practice.

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.