Argon is the element having a complete valence electron shell. The correct option is D.
What is a valance shell?
Valence electrons are found in an atom's outermost shell. It is known as valance shell.
A valence electron is an electron in an atom's outer shell that can take part in the establishment of a chemical bond if the outer shell is not shutdown.
Both atoms in a single covalent bond contribute one valence electron to form a shared pair.
The stability of an atom is determined by its valence electrons. Valence electrons are mostly in charge of an atom's stability.
The Octet Rule states that atoms start to obtain or lose electrons in order to achieve the octet state or have eight electrons in their valence shell. They become stable at this point.
Among the given elements, argon is the one that has a complete valence electron shell.
Thus, the correct option is D.
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