How many valence electrons does gallium have?
How many valence electrons does gallium have?
Answer:
Gallium has three valence electrons.
To find out the number of valence electrons in a gallium atom,we need to look at the periodic table.
The position of gallium in the periodic table is in group IIIA.For main group elements,valence electrons are equal to the group number.So,gallium atom has three valence electrons in its valence shell or outermost energy level.
Again,gallium is an element of group 13.Now just consider the unit place digit from group number.You are getting 3 which is equal to the number of valence electrons in gallium.
Here is the another way to find out the valence electrons of gallium.
The symbol of gallium is Ga and the atomic number of gallium is 31.So,it has thirty one electrons totally.
Now do the electronic configuration of gallium.
Ga(31) =1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
=[Ar]3d10 4s2 4p1
[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 three valence electrons.So each gallium has three valence electrons.
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