How many valence electrons does beryllium have?

How many valence electrons does beryllium have?

Answer:

 Beryllium has two valence electrons.

Explanation:

Beryllium atom has two valence electrons.These electrons are important for beryllium to form bonds with other atoms.

To find out the number of valence electrons in a beryllium 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 beryllium atom has two valence electrons in its valence shell.

Again,beryllium 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 valence electrons of beryllium.

The atomic number of beryllium is 4.So it has four electrons totally.

Now write the electronic configuration of beryllium.

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 beryllium atom has two valence electrons.