Name two chemical elements in whose atoms the outer energy levels are completely filled.

These chemical elements are the noble gases neon and argon:

10Ne (neon): in Ne atoms, the first and second energy sublevels are completely filled with electrons: 1s22s22p6;

19Ar (argon): all s and p orbitals are occupied in Ar atoms: 1s22s22p63s23p6.

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