If K and L shells of an atom are full, then what would be the total number of electrons in the atom?
Based on the Bohr-Bury scheme, we know that the maximum number of electrons that can be present in a particular energy shell of an atom is given by 2n 2 , where “n” is the number of energy shells.
Maximum Number of electrons in n th shell = 2n 2
For K shell, n =1
Maximum electrons = 2 x 1 2
= 2 x 1
= 2 electrons
For L shell, n =2
Maximum electrons = 2 x 2 2
= 2 x 4
= 8 electrons
Total number of electrons = Number of electrons in K Shell + Number of electrons in L Shell
= 2 + 8
= 10 electrons
There would be a total of 10 electrons if K and L shells are full.