Respuesta :

quasarJose

Answer:

argon (Ar)

Explanation:

Argon is the element from the given choices with a complete valence electron shell.

The valence electron shell is the outermost shell of an atom.

  • Elements with complete outermost shell are found in the 8th group on the period table.
  • In the 8th group, the elements are generally inert and unreactive.
  • Elements with this configuration have 8 electrons in their outermost shell and 2 for helium.
  • Some of the elements in this group are Helium and Neon

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