How many valence electrons does Ar have?
Solution:
Ar has eight valence electrons.
To find out the number of valence electrons in a Ar atom,we need to look at the periodic table.
The position of Ar in the periodic table is in group VIIIA.For main group elements,valence electrons are equal to the group number.So,Ar atom has eight valence electrons in its valence shell.
Ar is an element of group 18.Now just consider the unit place digit from group number.You are getting 8 which is equal to the number of valence electrons in Ar.
Here is the another way to find out the valence electrons of argon.
The symbol of argon is Ar and the atomic number of argon is 18.So,it has eighteen electrons totally.
Now do the electronic configuration of argon.
Ar(18) =1s2 2s2 2p6 3s2 3p6
=[Ne] 3s2 3p6
The valence shell is the outermost shell and the electrons that are present in valence shell is called valence electrons.
The valence shell or energy level can be identified by the highest value of principal quantum number ,n.Here the highest value of n is 3.So,the valence shell is the 3rd shell.
In 3rd shell ,we get eight valence electrons.So each Ar has seven valence electrons.
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