How many valence electrons does arsenic have?
How many valence electrons does arsenic have?
Answer:Arsenic has five valence electrons.
Explanation:
To find out the number of valence electrons in a arsenic atom,we need to look at the periodic table.
The position of arsenic in the periodic table is in group VA.For main group elements,valence electrons are equal to the group number.So,arsenic atom has five valence electrons in its valence shell or outermost energy level.
Again, arsenic is an element of group 15.Now just consider the unit place digit from group number.You are getting 5 which is equal to the number of valence electrons in arsenic.
Here is the another way to find out the valence electrons of arsenic.
The symbol of arsenic is As and the atomic number of arsenic is 33.So,it has thirty three electrons totally.
Now do the electronic configuration of arsenic.
As(33) =1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3
=[Ar] 3d10 4s2 4p3
[Tip: Complete filled d orbital is not considered as part of valence shell or energy level]
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 4.So,the valence shell is the 4th shell or energy level.
In 4th shell ,we get five valence electrons.So each arsenic has five valence electrons.
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