【】How Many Valence Electrons Does Selenium (Se) Have?|| Selenium (Se) Valence Electrons

Selenium has six valence electrons.

Read:CO2 Lewis Structure

Explanation:

Now I am going to show you how to find valence electrons in selenium in just 5 steps.

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             Step-1:

First, find the atomic number of selenium from periodic table.

From periodic table ,we see that the atomic number of selenium is 34.

                 Step-2:

We know that the atomic number of selenium is 34.So selenium has 34 protons and 34 electrons as the charge of electrons and protons are equal but opposite in nature.The charge of proton is +1 and the charge of electron is -1.

Read:CO2 Lewis Structure

                Step-3:

Now write the electron configuration of selenium .

Se(34)=1s²2s²2p⁶3s²3p⁶4s²3d¹º4p⁴

Rewrite this from low to high value of n.
Se(34)=1s²2s²2p⁶3s²3p⁶
3d¹º4s²4p⁴

Read:CO2 Lewis Structure

                Step-4:

Se(34)=1s²2s²2p⁶3s²3p⁶
3d¹º4s²4p⁴

Now we will find out valence shell of selenium from the electronic configuration of selenium.

Se(34)=1s²2s²2p⁶3s²3p⁶
3d¹º4s²4p⁴

Valence shell can be found from the highest number of principal quantum number.

You know that principal quantum number is expressed by n.

Se(34)=1s²2s²2p⁶3s²3p⁶
3d¹º4s²4p⁴

Here the highest value of n is 4.SoThe valence shell of selenium is 4s²4p⁴

                 Step-5

In this step,we will find out the valence electrons of selenium.

We have to bear in mind that the electrons of valence shell are called valence electrons.

Se(34)=1s²2s²2p⁶3s²3p⁶
3d¹º4s²4p⁴

From the above electron configuration of selenium,we see that selenium has 6 valence electrons in its valence shell(4s²4p⁴).

So, there are six valence electrons in selenium .

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Questions and Answers

●How many valence electrons are there in an atom of selenium with electron configuration Se 1s22s22p63s23p64s23d104p4?

Answer:

 There are six valence electrons in an atom of selenium with electron configuration1s22s22p63s23p64s23d104p4.