How many valence electrons does Be have?
Answer:
Be has two valence electrons.
To find out the number of valence electrons in a Be atom,we need to look at the periodic table.
The position of beryllium in the periodic table is in group 2A.For main group elements,valence electrons are equal to the group number.So a Be atom has two valence electrons in its valence shell.
Again,Be is an element of group 2.Now just consider the unit place digit from group number.You are getting 2 which is equal to the number of valence electrons in beryllium.
Here is the another way to find out the number of valence electrons of Be.
The atomic number of Be is 4.So it has four electrons totally.
Now write the electronic configuration of Be.
Be(4) =1s2 2s2
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 2.So,the valence shell is the 2nd shell.
In 2nd shell we get 2 valence electrons.So each Be atom has two valence electrons.
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