How many valence electrons does Al have?
Answer:
Al has three valence electrons.
To find out the number of valence electrons in a Al atom,we need to look at the periodic table.
The position of Al in the periodic table is in group 3A.For main group elements,valence electrons are equal to the group number.So,Al atom has three valence electrons in its valence shell.
Al 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 aluminum.
Here is the another way to find out the valence electrons of aluminum.
The symbol of aluminum is Al and the atomic number of aluminum is 13.So, it has thirteen electrons totally.
Now do the electronic configuration of Al.
Al(13) =1s2 2s2 2p6 3s2 3p1
=[Ne] 3s2 3p1
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 three valence electrons.So each Al has three valence electrons.
Comments
Post a Comment