Valence Electrons | My Journey In Science 4

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Today we discussed about the Atomic Bond including the octet rule and the valence electrons. We also figured out how to find the electron configuration. We just tackled a few lessons today so this blog is going to be short only.


Octet Rule 

I learned that I need to remind myself the word stability and must have 8 valence electrons in its outermost energy to be stable. Octet rule was proposed by Gilbert Newton Lewis. 


Valence Electrons

We have discussed about the valence electrons which refers to the distribution of electrons at different positions in an atom. We used the Periodic Table of elements for this lesson. We needed to use the table of elements to see the atomic number in each element. 

To get the electron configuration, you must know how to use the electron configuration chart which involves the numbers( 2,6 10 and 14)  and the letters (s, p, d, and f) next, you should check out the atomic number of the given element. After that, you will now use the electron configuration chart for checking the electron configuration form of the atomic number of the element.

One way to make sure that your electron configuration form is right, if the total of the added exponents has the same amount of the atomic number.

Here are some examples of the noble gases which has 8 valence electrons;

10Ne - 1s^2 2s^2 2p^4 

18Ar - 1s^2 2s^2 2p^4 3s^2 3p^6

36Kr - 1s^2 2s^2 2p^4 3s^2 3p^6  4s^2 3d^10 4p^6

54Xe - 1s^2 2s^2 2p^4 3s^2 3p^6  4s^2 3d^10 4p^6 5s^2 4d^10 5p^6

86Rn - 1s^2 2s^2 2p^4 3s^2 3p^6  4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^2 5d^10 6p^6

All the red texts symbolizes as the outermost energy level of the electrons which is also called as valence shell. As you will notice, the outermost part of it has exactly 8 valence electrons which means they are all stable. 

Our teacher also told us the easiest way to know what is the valence electron of an element. As you will look on the periodic table, just simply check the group on where the element belongs.


 
Example:

Nitrogen(N) is in Group 5A (or VA) of the periodic table. So meaning to say, the valence electron of Nitrogen is 5. 











And that's it for today. I hope you learned something from me today. 

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