List the symbols for all the elements whose electron configurations end as follows. Each n represents an energy level ns2 np6 nd2 (n+1)s2

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

one state would change   like louisiana to texas. thats a change

explanation:

its first and third is your answer i did the qustion the fourth isnt right