Question

In an atom first four shells k l m and n are completely filled then what is the total number of electron in that atom

Answer 1

The total number of electron in an atom whose first four shells k l m and n are completely filled is equal to 36.

• Completely filled shells corresponds to noble gas configuration.
• Since the n-shell(4th shell) is completely filled, the element is Krypton.
• Total number of electrons in k shell is equal to 2 (1s).
• Total number of electrons in l shell is equal to 8 (2s and 2p).
• Total number of electrons in m shell is equal to 18 (3s , 3p and 3d).
• Total number of electrons in n shell is equal to 8 (4s and 4p).