How many valence electrons does krypton have?

Answer:

Krypton  has eight valence electrons.

Explanation:

To find out the number of valence electrons in a krypton atom,we need to look at the periodic table.

The position of krypton in the periodic table  is in group VIIIA.For main group elements,valence electrons are equal to the group number.So,krypton atom has eight valence electrons in its valence shell or outermost energy level.

Again, krypton is an element of group 18.Now just consider the unit place digit from group number.You are getting 8 which is equal to the number of valence electrons in krypton.

Here is the another way to find out the valence electrons of krypton.

The symbol of krypton is Kr and the atomic number of krypton is 36.So,it has thirty six electrons totally.

Now do the electronic configuration of krypton.

Kr(36) =1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

             =[Ar] 3d10 4s2 4p6

[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 eight valence electrons.So each krypton has eight valence electrons.

Next.                     Previous